87687797 has 4 divisors (see below), whose sum is σ = 88246476. Its totient is φ = 87129120.

The previous prime is 87687779. The next prime is 87687829. The reversal of 87687797 is 79778678.

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 13830961 + 73856836 = 3719^2 + 8594^2 .

It is a cyclic number.

It is not a de Polignac number, because 87687797 - 2²² = 83493493 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 (87687497) 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, 279104 + ... + 279417.

It is an arithmetic number, because the mean of its divisors is an integer number (22061619).

Almost surely, 2^87687797 is an apocalyptic number.

It is an amenable number.

87687797 is a deficient number, since it is larger than the sum of its proper divisors (558679).

87687797 is a wasteful number, since it uses less digits than its factorization.

87687797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558678.

The product of its digits is 8297856, while the sum is 59.

The square root of 87687797 is about 9364.1762584864. The cubic root of 87687797 is about 444.2693847896.

The spelling of 87687797 in words is "eighty-seven million, six hundred eighty-seven thousand, seven hundred ninety-seven".