87348640931 has 4 divisors (see below), whose sum is σ = 91146407952. Its totient is φ = 83550873912.

The previous prime is 87348640927. The next prime is 87348640961. The reversal of 87348640931 is 13904684378.

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

It is a cyclic number.

It is not a de Polignac number, because 87348640931 - 2² = 87348640927 is a prime.

It is a super-2 number, since 2×87348640931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87348640961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1898883476 + ... + 1898883521.

It is an arithmetic number, because the mean of its divisors is an integer number (22786601988).

Almost surely, 2^87348640931 is an apocalyptic number.

87348640931 is a deficient number, since it is larger than the sum of its proper divisors (3797767021).

87348640931 is a wasteful number, since it uses less digits than its factorization.

87348640931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797767020.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 87348640931 in words is "eighty-seven billion, three hundred forty-eight million, six hundred forty thousand, nine hundred thirty-one".