87291907 has 4 divisors (see below), whose sum is σ = 87317080. Its totient is φ = 87266736.

The previous prime is 87291899. The next prime is 87291931. The reversal of 87291907 is 70919278.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70919278 = 2 ⋅35459639.

It is a cyclic number.

It is not a de Polignac number, because 87291907 - 2³ = 87291899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87291937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6357 + ... + 14662.

It is an arithmetic number, because the mean of its divisors is an integer number (21829270).

Almost surely, 2^87291907 is an apocalyptic number.

87291907 is a deficient number, since it is larger than the sum of its proper divisors (25173).

87291907 is a wasteful number, since it uses less digits than its factorization.

87291907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25172.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 87291907 is about 9343.0138071181. The cubic root of 87291907 is about 443.5997851146.

The spelling of 87291907 in words is "eighty-seven million, two hundred ninety-one thousand, nine hundred seven".