87702491 has 4 divisors (see below), whose sum is σ = 87763584. Its totient is φ = 87641400.

The previous prime is 87702463. The next prime is 87702521. The reversal of 87702491 is 19420778.

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 87702491 - 2¹⁸ = 87440347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87702401) 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, 28340 + ... + 31281.

It is an arithmetic number, because the mean of its divisors is an integer number (21940896).

Almost surely, 2^87702491 is an apocalyptic number.

87702491 is a deficient number, since it is larger than the sum of its proper divisors (61093).

87702491 is a wasteful number, since it uses less digits than its factorization.

87702491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61092.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 87702491 is about 9364.9608114503. The cubic root of 87702491 is about 444.2941990738.

The spelling of 87702491 in words is "eighty-seven million, seven hundred two thousand, four hundred ninety-one".