87392905 has 4 divisors (see below), whose sum is σ = 104871492. Its totient is φ = 69914320.

The previous prime is 87392897. The next prime is 87392917. The reversal of 87392905 is 50929378.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41641209 + 45751696 = 6453^2 + 6764^2 .

It is not a de Polignac number, because 87392905 - 2³ = 87392897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8739286 + ... + 8739295.

It is an arithmetic number, because the mean of its divisors is an integer number (26217873).

Almost surely, 2^87392905 is an apocalyptic number.

It is an amenable number.

87392905 is a deficient number, since it is larger than the sum of its proper divisors (17478587).

87392905 is a wasteful number, since it uses less digits than its factorization.

87392905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17478586.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 87392905 is about 9348.4172457160. The cubic root of 87392905 is about 443.7708029658.

The spelling of 87392905 in words is "eighty-seven million, three hundred ninety-two thousand, nine hundred five".