690609408 has 72 divisors (see below), whose sum is σ = 1917991488. Its totient is φ = 220188672.

The previous prime is 690609383. The next prime is 690609421. The reversal of 690609408 is 804906096.

It is a super-2 number, since 2×690609408² = 953882708836220928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 690609408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1885 + ... + 37212.

Almost surely, 2^690609408 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 690609408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958995744).

690609408 is an abundant number, since it is smaller than the sum of its proper divisors (1227382080).

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

690609408 is a wasteful number, since it uses less digits than its factorization.

690609408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39139 (or 39125 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 690609408 is about 26279.4483960375. The cubic root of 690609408 is about 883.9156638966.

The spelling of 690609408 in words is "six hundred ninety million, six hundred nine thousand, four hundred eight".