608631990 has 64 divisors (see below), whose sum is σ = 1559900160. Its totient is φ = 151643520.

The previous prime is 608631979. The next prime is 608632027. The reversal of 608631990 is 99136806.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15687 + ... + 38253.

It is an arithmetic number, because the mean of its divisors is an integer number (24373440).

Almost surely, 2^608631990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 608631990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (779950080).

608631990 is an abundant number, since it is smaller than the sum of its proper divisors (951268170).

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

608631990 is a wasteful number, since it uses less digits than its factorization.

608631990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22637.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 608631990 is about 24670.4679728618. The cubic root of 608631990 is about 847.4581457041.

Subtracting from 608631990 its reverse (99136806), we obtain a square (509495184 = 22572²).

The spelling of 608631990 in words is "six hundred eight million, six hundred thirty-one thousand, nine hundred ninety".