900640688 has 20 divisors (see below), whose sum is σ = 1847638440. Its totient is φ = 423830784.

The previous prime is 900640673. The next prime is 900640747. The reversal of 900640688 is 886046009.

It is a super-2 number, since 2×900640688² = 1622307297762226688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655318 + ... + 1655861.

It is an arithmetic number, because the mean of its divisors is an integer number (92381922).

Almost surely, 2^900640688 is an apocalyptic number.

It is an amenable number.

900640688 is an abundant number, since it is smaller than the sum of its proper divisors (946997752).

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

900640688 is a wasteful number, since it uses less digits than its factorization.

900640688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311204 (or 3311198 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 900640688 is about 30010.6762336339. The cubic root of 900640688 is about 965.7184330269.

It can be divided in two parts, 9006 and 40688, that added together give a palindrome (49694).

The spelling of 900640688 in words is "nine hundred million, six hundred forty thousand, six hundred eighty-eight".