87399797 has 4 divisors (see below), whose sum is σ = 88201740. Its totient is φ = 86597856.

The previous prime is 87399733. The next prime is 87399803. The reversal of 87399797 is 79799378.

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 40627876 + 46771921 = 6374^2 + 6839^2 .

It is a cyclic number.

It is not a de Polignac number, because 87399797 - 2⁶ = 87399733 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 (87399097) 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, 400808 + ... + 401025.

It is an arithmetic number, because the mean of its divisors is an integer number (22050435).

Almost surely, 2^87399797 is an apocalyptic number.

It is an amenable number.

87399797 is a deficient number, since it is larger than the sum of its proper divisors (801943).

87399797 is a wasteful number, since it uses less digits than its factorization.

87399797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801942.

The product of its digits is 6001128, while the sum is 59.

The square root of 87399797 is about 9348.7858569977. The cubic root of 87399797 is about 443.7824682452.

The spelling of 87399797 in words is "eighty-seven million, three hundred ninety-nine thousand, seven hundred ninety-seven".