791787987 has 16 divisors (see below), whose sum is σ = 1173698560. Its totient is φ = 527553000.

The previous prime is 791787961. The next prime is 791788013. The reversal of 791787987 is 789787197.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (791787961) and next prime (791788013).

It is not a de Polignac number, because 791787987 - 2⁶ = 791787923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (791787917) 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, 45162 + ... + 60192.

It is an arithmetic number, because the mean of its divisors is an integer number (73356160).

Almost surely, 2^791787987 is an apocalyptic number.

791787987 is a deficient number, since it is larger than the sum of its proper divisors (381910573).

791787987 is a wasteful number, since it uses less digits than its factorization.

791787987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16991 (or 16985 counting only the distinct ones).

The product of its digits is 12446784, while the sum is 63.

The square root of 791787987 is about 28138.7275298653. The cubic root of 791787987 is about 925.1304367313.

The spelling of 791787987 in words is "seven hundred ninety-one million, seven hundred eighty-seven thousand, nine hundred eighty-seven".