87820302591 has 48 divisors (see below), whose sum is σ = 154085168640. Its totient is φ = 47080180800.

The previous prime is 87820302587. The next prime is 87820302607. The reversal of 87820302591 is 19520302878.

It is a happy number.

87820302591 is a `hidden beast` number, since 8 + 7 + 8 + 20 + 30 + 2 + 591 = 666.

It is not a de Polignac number, because 87820302591 - 2² = 87820302587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87820302511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 232860 + ... + 479441.

It is an arithmetic number, because the mean of its divisors is an integer number (3210107680).

Almost surely, 2^87820302591 is an apocalyptic number.

87820302591 is a deficient number, since it is larger than the sum of its proper divisors (66264866049).

87820302591 is a wasteful number, since it uses less digits than its factorization.

87820302591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712436 (or 712433 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 87820302591 in words is "eighty-seven billion, eight hundred twenty million, three hundred two thousand, five hundred ninety-one".