690942728 has 24 divisors (see below), whose sum is σ = 1507031550. Its totient is φ = 296118144.

The previous prime is 690942727. The next prime is 690942739. The reversal of 690942728 is 827249096.

It can be written as a sum of positive squares in only one way, i.e., 647091844 + 43850884 = 25438^2 + 6622^2 .

It is not an unprimeable number, because it can be changed into a prime (690942727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 880913 + ... + 881696.

Almost surely, 2^690942728 is an apocalyptic number.

It is an amenable number.

690942728 is an abundant number, since it is smaller than the sum of its proper divisors (816088822).

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

690942728 is a wasteful number, since it uses less digits than its factorization.

690942728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762629 (or 1762618 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 690942728 is about 26285.7894688366. The cubic root of 690942728 is about 884.0578472004.

The spelling of 690942728 in words is "six hundred ninety million, nine hundred forty-two thousand, seven hundred twenty-eight".