690768540 has 384 divisors, whose sum is σ = 2757888000. Its totient is φ = 139345920.

The previous prime is 690768539. The next prime is 690768569. The reversal of 690768540 is 45867096.

It is a super-2 number, since 2×690768540² = 954322351707463200, which contains 22 as substring.

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

It is a congruent number.

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 127 ways as a sum of consecutive naturals, for example, 1538236 + ... + 1538684.

It is an arithmetic number, because the mean of its divisors is an integer number (7182000).

Almost surely, 2^690768540 is an apocalyptic number.

690768540 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 690768540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1378944000).

690768540 is an abundant number, since it is smaller than the sum of its proper divisors (2067119460).

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

690768540 is a wasteful number, since it uses less digits than its factorization.

690768540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 690768540 is about 26282.4759107661. The cubic root of 690768540 is about 883.9835500580.

The spelling of 690768540 in words is "six hundred ninety million, seven hundred sixty-eight thousand, five hundred forty".