690571728 has 240 divisors, whose sum is σ = 2451426432. Its totient is φ = 176256000.

The previous prime is 690571727. The next prime is 690571729. The reversal of 690571728 is 827175096.

690571728 is a `hidden beast` number, since 6 + 9 + 0 + 571 + 72 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (690571727) and next prime (690571729).

It is a super-3 number, since 3×690571728³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690571727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 675858 + ... + 676878.

Almost surely, 2^690571728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690571728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1225713216).

690571728 is an abundant number, since it is smaller than the sum of its proper divisors (1760854704).

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

690571728 is a wasteful number, since it uses less digits than its factorization.

690571728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 690571728 is about 26278.7314762338. The cubic root of 690571728 is about 883.8995879751.

The spelling of 690571728 in words is "six hundred ninety million, five hundred seventy-one thousand, seven hundred twenty-eight".