990601388 has 24 divisors (see below), whose sum is σ = 1982467872. Its totient is φ = 424272384.

The previous prime is 990601361. The next prime is 990601439. The reversal of 990601388 is 883106099.

It is a super-2 number, since 2×990601388² = 1962582219815053088, which contains 22 as substring.

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, 36956 + ... + 57852.

It is an arithmetic number, because the mean of its divisors is an integer number (82602828).

Almost surely, 2^990601388 is an apocalyptic number.

It is an amenable number.

990601388 is an abundant number, since it is smaller than the sum of its proper divisors (991866484).

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

990601388 is a wasteful number, since it uses less digits than its factorization.

990601388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22601 (or 22599 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 990601388 is about 31473.8206768737. The cubic root of 990601388 is about 996.8572628835.

The spelling of 990601388 in words is "nine hundred ninety million, six hundred one thousand, three hundred eighty-eight".