87249479 has 4 divisors (see below), whose sum is σ = 87487584. Its totient is φ = 87011376.

The previous prime is 87249467. The next prime is 87249497. The reversal of 87249479 is 97494278.

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 87249479 - 2¹² = 87245383 is a prime.

It is a super-2 number, since 2×87249479² = 15224943171542882, 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 (87249439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118502 + ... + 119235.

It is an arithmetic number, because the mean of its divisors is an integer number (21871896).

Almost surely, 2^87249479 is an apocalyptic number.

87249479 is a deficient number, since it is larger than the sum of its proper divisors (238105).

87249479 is a wasteful number, since it uses less digits than its factorization.

87249479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238104.

The product of its digits is 1016064, while the sum is 50.

The square root of 87249479 is about 9340.7429576025. The cubic root of 87249479 is about 443.5279033008.

The spelling of 87249479 in words is "eighty-seven million, two hundred forty-nine thousand, four hundred seventy-nine".