30897887 has 16 divisors (see below), whose sum is σ = 32931360. Its totient is φ = 28953600.

The previous prime is 30897883. The next prime is 30897899. The reversal of 30897887 is 78879803.

It is a cyclic number.

It is not a de Polignac number, because 30897887 - 2² = 30897883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30897883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128087 + ... + 128327.

It is an arithmetic number, because the mean of its divisors is an integer number (2058210).

Almost surely, 2^30897887 is an apocalyptic number.

30897887 is a deficient number, since it is larger than the sum of its proper divisors (2033473).

30897887 is a wasteful number, since it uses less digits than its factorization.

30897887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 30897887 is about 5558.5867808284. The cubic root of 30897887 is about 313.7927656081.

The spelling of 30897887 in words is "thirty million, eight hundred ninety-seven thousand, eight hundred eighty-seven".