87764431 has 2 divisors, whose sum is σ = 87764432. Its totient is φ = 87764430.

The previous prime is 87764429. The next prime is 87764459. The reversal of 87764431 is 13446778.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87764431 - 2¹ = 87764429 is a prime.

It is a super-2 number, since 2×87764431² = 15405190697507522, which contains 22 as substring.

Together with 87764429, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87764731) 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 as a sum of consecutive naturals, namely, 43882215 + 43882216.

It is an arithmetic number, because the mean of its divisors is an integer number (43882216).

Almost surely, 2^87764431 is an apocalyptic number.

87764431 is a deficient number, since it is larger than the sum of its proper divisors (1).

87764431 is an equidigital number, since it uses as much as digits as its factorization.

87764431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 87764431 is about 9368.2672357272. The cubic root of 87764431 is about 444.3987689149.

The spelling of 87764431 in words is "eighty-seven million, seven hundred sixty-four thousand, four hundred thirty-one".