308661990 has 64 divisors (see below), whose sum is σ = 911748096. Its totient is φ = 65123712.

The previous prime is 308661971. The next prime is 308662021. The reversal of 308661990 is 99166803.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 53802 + ... + 59261.

It is an arithmetic number, because the mean of its divisors is an integer number (14246064).

Almost surely, 2^308661990 is an apocalyptic number.

308661990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

308661990 is an abundant number, since it is smaller than the sum of its proper divisors (603086106).

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

308661990 is a wasteful number, since it uses less digits than its factorization.

308661990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113093.

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

The square root of 308661990 is about 17568.7788420254. The cubic root of 308661990 is about 675.8148294221.

The spelling of 308661990 in words is "three hundred eight million, six hundred sixty-one thousand, nine hundred ninety".