87973777 has 4 divisors (see below), whose sum is σ = 88752420. Its totient is φ = 87195136.

The previous prime is 87973751. The next prime is 87973813. The reversal of 87973777 is 77737978.

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 5363856 + 82609921 = 2316^2 + 9089^2 .

It is a cyclic number.

It is not a de Polignac number, because 87973777 - 2⁷ = 87973649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87973177) 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, 389152 + ... + 389377.

It is an arithmetic number, because the mean of its divisors is an integer number (22188105).

Almost surely, 2^87973777 is an apocalyptic number.

It is an amenable number.

87973777 is a deficient number, since it is larger than the sum of its proper divisors (778643).

87973777 is a wasteful number, since it uses less digits than its factorization.

87973777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778642.

The product of its digits is 3630312, while the sum is 55.

The square root of 87973777 is about 9379.4337249111. The cubic root of 87973777 is about 444.7518323383.

The spelling of 87973777 in words is "eighty-seven million, nine hundred seventy-three thousand, seven hundred seventy-seven".