690571980 has 288 divisors, whose sum is σ = 2536095744. Its totient is φ = 154462464.

The previous prime is 690571969. The next prime is 690571991. The reversal of 690571980 is 89175096.

It is an interprime number because it is at equal distance from previous prime (690571969) and next prime (690571991).

It is a super-3 number, since 3×690571980³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1802869 + ... + 1803251.

It is an arithmetic number, because the mean of its divisors is an integer number (8805888).

Almost surely, 2^690571980 is an apocalyptic number.

690571980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690571980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1268047872).

690571980 is an abundant number, since it is smaller than the sum of its proper divisors (1845523764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690571980 is a wasteful number, since it uses less digits than its factorization.

690571980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 690571980 is about 26278.7362709853. The cubic root of 690571980 is about 883.8996954912.

The spelling of 690571980 in words is "six hundred ninety million, five hundred seventy-one thousand, nine hundred eighty".