87400779 has 8 divisors (see below), whose sum is σ = 122667840. Its totient is φ = 55200456.

The previous prime is 87400769. The next prime is 87400829. The reversal of 87400779 is 97700478.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87400779 - 2⁹ = 87400267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87400779.

It is not an unprimeable number, because it can be changed into a prime (87400769) 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 7 ways as a sum of consecutive naturals, for example, 766617 + ... + 766730.

It is an arithmetic number, because the mean of its divisors is an integer number (15333480).

Almost surely, 2^87400779 is an apocalyptic number.

87400779 is a deficient number, since it is larger than the sum of its proper divisors (35267061).

87400779 is a wasteful number, since it uses less digits than its factorization.

87400779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533369.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 87400779 is about 9348.8383770391. The cubic root of 87400779 is about 443.7841303114.

The spelling of 87400779 in words is "eighty-seven million, four hundred thousand, seven hundred seventy-nine".