87277391 has 4 divisors (see below), whose sum is σ = 87553032. Its totient is φ = 87001752.

The previous prime is 87277367. The next prime is 87277417. The reversal of 87277391 is 19377278.

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 87277391 - 2²⁶ = 20168527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87277331) 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, 137345 + ... + 137978.

It is an arithmetic number, because the mean of its divisors is an integer number (21888258).

Almost surely, 2^87277391 is an apocalyptic number.

87277391 is a deficient number, since it is larger than the sum of its proper divisors (275641).

87277391 is a wasteful number, since it uses less digits than its factorization.

87277391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275640.

The product of its digits is 148176, while the sum is 44.

The square root of 87277391 is about 9342.2369376932. The cubic root of 87277391 is about 443.5751946278.

The spelling of 87277391 in words is "eighty-seven million, two hundred seventy-seven thousand, three hundred ninety-one".