87718491 has 16 divisors (see below), whose sum is σ = 148518400. Its totient is φ = 50124744.

The previous prime is 87718451. The next prime is 87718507. The reversal of 87718491 is 19481778.

It is not a de Polignac number, because 87718491 - 2¹³ = 87710299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87718451) 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, 231871 + ... + 232248.

It is an arithmetic number, because the mean of its divisors is an integer number (9282400).

Almost surely, 2^87718491 is an apocalyptic number.

87718491 is a deficient number, since it is larger than the sum of its proper divisors (60799909).

87718491 is a wasteful number, since it uses less digits than its factorization.

87718491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464135 (or 464129 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 87718491 is about 9365.8150205948. The cubic root of 87718491 is about 444.3212156950.

It can be divided in two parts, 87718 and 491, that added together give a square (88209 = 297²).

The spelling of 87718491 in words is "eighty-seven million, seven hundred eighteen thousand, four hundred ninety-one".