87499477 has 16 divisors (see below), whose sum is σ = 97638912. Its totient is φ = 77898240.

The previous prime is 87499441. The next prime is 87499481. The reversal of 87499477 is 77499478.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87499477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87499417) 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, 42373 + ... + 44389.

It is an arithmetic number, because the mean of its divisors is an integer number (6102432).

Almost surely, 2^87499477 is an apocalyptic number.

It is an amenable number.

87499477 is a deficient number, since it is larger than the sum of its proper divisors (10139435).

87499477 is a wasteful number, since it uses less digits than its factorization.

87499477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148.

The product of its digits is 3556224, while the sum is 55.

The square root of 87499477 is about 9354.1155113672. The cubic root of 87499477 is about 443.9511163480.

Subtracting from 87499477 its reverse (77499478), we obtain a palindrome (9999999).

The spelling of 87499477 in words is "eighty-seven million, four hundred ninety-nine thousand, four hundred seventy-seven".