690086720 has 28 divisors (see below), whose sum is σ = 1643269764. Its totient is φ = 276034560.

The previous prime is 690086711. The next prime is 690086723. The reversal of 690086720 is 27680096.

It can be written as a sum of positive squares in 2 ways, for example, as 506430016 + 183656704 = 22504^2 + 13552^2 .

It is a super-2 number, since 2×690086720² = 952439362240716800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690086723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077941 + ... + 1078580.

Almost surely, 2^690086720 is an apocalyptic number.

It is an amenable number.

690086720 is an abundant number, since it is smaller than the sum of its proper divisors (953183044).

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

690086720 is a wasteful number, since it uses less digits than its factorization.

690086720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156538 (or 2156528 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 690086720 is about 26269.5017082548. The cubic root of 690086720 is about 883.6926103094.

The spelling of 690086720 in words is "six hundred ninety million, eighty-six thousand, seven hundred twenty".