87702391 has 4 divisors (see below), whose sum is σ = 100231312. Its totient is φ = 75173472.

The previous prime is 87702389. The next prime is 87702401. The reversal of 87702391 is 19320778.

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 87702391 - 2¹ = 87702389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87702391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87702341) 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, 6264450 + ... + 6264463.

It is an arithmetic number, because the mean of its divisors is an integer number (25057828).

Almost surely, 2^87702391 is an apocalyptic number.

87702391 is a deficient number, since it is larger than the sum of its proper divisors (12528921).

87702391 is a wasteful number, since it uses less digits than its factorization.

87702391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12528920.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 87702391 is about 9364.9554723981. The cubic root of 87702391 is about 444.2940302095.

The spelling of 87702391 in words is "eighty-seven million, seven hundred two thousand, three hundred ninety-one".