30996990 has 48 divisors (see below), whose sum is σ = 80943408. Its totient is φ = 8229888.

The previous prime is 30996989. The next prime is 30996991. The reversal of 30996990 is 9969903.

It is an interprime number because it is at equal distance from previous prime (30996989) and next prime (30996991).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30996991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24862 + ... + 26078.

It is an arithmetic number, because the mean of its divisors is an integer number (1686321).

Almost surely, 2^30996990 is an apocalyptic number.

30996990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30996990 is an abundant number, since it is smaller than the sum of its proper divisors (49946418).

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

30996990 is a wasteful number, since it uses less digits than its factorization.

30996990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513 (or 1510 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 30996990 is about 5567.4940502887. The cubic root of 30996990 is about 314.1278976458.

The spelling of 30996990 in words is "thirty million, nine hundred ninety-six thousand, nine hundred ninety".