87257479 has 4 divisors (see below), whose sum is σ = 87277320. Its totient is φ = 87237640.

The previous prime is 87257477. The next prime is 87257483. The reversal of 87257479 is 97475278.

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 87257479 - 2¹ = 87257477 is a prime.

It is a super-2 number, since 2×87257479² = 15227735282870882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87257477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49 + ... + 13210.

It is an arithmetic number, because the mean of its divisors is an integer number (21819330).

Almost surely, 2^87257479 is an apocalyptic number.

87257479 is a deficient number, since it is larger than the sum of its proper divisors (19841).

87257479 is a wasteful number, since it uses less digits than its factorization.

87257479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19840.

The product of its digits is 987840, while the sum is 49.

The square root of 87257479 is about 9341.1711792473. The cubic root of 87257479 is about 443.5414587391.

The spelling of 87257479 in words is "eighty-seven million, two hundred fifty-seven thousand, four hundred seventy-nine".