690091992 has 96 divisors (see below), whose sum is σ = 1976607360. Its totient is φ = 217152000.

The previous prime is 690091981. The next prime is 690092021. The reversal of 690091992 is 299190096.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87742 + ... + 95282.

It is an arithmetic number, because the mean of its divisors is an integer number (20589660).

Almost surely, 2^690091992 is an apocalyptic number.

690091992 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690091992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (988303680).

690091992 is an abundant number, since it is smaller than the sum of its proper divisors (1286515368).

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

690091992 is a wasteful number, since it uses less digits than its factorization.

690091992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7625 (or 7618 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 690091992 is about 26269.6020525626. The cubic root of 690091992 is about 883.6948606621.

The spelling of 690091992 in words is "six hundred ninety million, ninety-one thousand, nine hundred ninety-two".