87799847 has 4 divisors (see below), whose sum is σ = 89288040. Its totient is φ = 86311656.

The previous prime is 87799823. The next prime is 87799867. The reversal of 87799847 is 74899778.

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 87799847 - 2²⁴ = 71022631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 1488133 = 87799847 / (8 + 7 + 7 + 9 + 9 + 8 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87799867) 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, 744008 + ... + 744125.

It is an arithmetic number, because the mean of its divisors is an integer number (22322010).

Almost surely, 2^87799847 is an apocalyptic number.

87799847 is a deficient number, since it is larger than the sum of its proper divisors (1488193).

87799847 is a wasteful number, since it uses less digits than its factorization.

87799847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488192.

The product of its digits is 7112448, while the sum is 59.

The square root of 87799847 is about 9370.1572558842. The cubic root of 87799847 is about 444.4585376619.

The spelling of 87799847 in words is "eighty-seven million, seven hundred ninety-nine thousand, eight hundred forty-seven".