690415728 has 80 divisors (see below), whose sum is σ = 1833445152. Its totient is φ = 223744000.

The previous prime is 690415727. The next prime is 690415741. The reversal of 690415728 is 827514096.

It is a self number, because there is not a number n which added to its sum of digits gives 690415728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690415721) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 906868 + ... + 907628.

Almost surely, 2^690415728 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 690415728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916722576).

690415728 is an abundant number, since it is smaller than the sum of its proper divisors (1143029424).

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

690415728 is a wasteful number, since it uses less digits than its factorization.

690415728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274 (or 1268 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 690415728 is about 26275.7631287847. The cubic root of 690415728 is about 883.8330253892.

The spelling of 690415728 in words is "six hundred ninety million, four hundred fifteen thousand, seven hundred twenty-eight".