30887897 has 4 divisors (see below), whose sum is σ = 30903780. Its totient is φ = 30872016.

The previous prime is 30887893. The next prime is 30887903. The reversal of 30887897 is 79878803.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 373321 + 30514576 = 611^2 + 5524^2 .

It is a cyclic number.

It is not a de Polignac number, because 30887897 - 2² = 30887893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30887891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4538 + ... + 9075.

It is an arithmetic number, because the mean of its divisors is an integer number (7725945).

Almost surely, 2^30887897 is an apocalyptic number.

30887897 is the 4538-th pentagonal number.

It is an amenable number.

30887897 is a deficient number, since it is larger than the sum of its proper divisors (15883).

30887897 is a wasteful number, since it uses less digits than its factorization.

30887897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15882.

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

The square root of 30887897 is about 5557.6880984812. The cubic root of 30887897 is about 313.7589431481.

The spelling of 30887897 in words is "thirty million, eight hundred eighty-seven thousand, eight hundred ninety-seven".