30897988 has 48 divisors (see below), whose sum is σ = 61415424. Its totient is φ = 13479840.

The previous prime is 30897983. The next prime is 30897991. The reversal of 30897988 is 88979803.

It is not an unprimeable number, because it can be changed into a prime (30897983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138445 + ... + 138667.

It is an arithmetic number, because the mean of its divisors is an integer number (1279488).

Almost surely, 2^30897988 is an apocalyptic number.

It is an amenable number.

30897988 is a deficient number, since it is larger than the sum of its proper divisors (30517436).

30897988 is a wasteful number, since it uses less digits than its factorization.

30897988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 30897988 is about 5558.5958658640. The cubic root of 30897988 is about 313.7931075196.

The spelling of 30897988 in words is "thirty million, eight hundred ninety-seven thousand, nine hundred eighty-eight".