87290369 has 4 divisors (see below), whose sum is σ = 87344340. Its totient is φ = 87236400.

The previous prime is 87290303. The next prime is 87290381. The reversal of 87290369 is 96309278.

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 65011969 + 22278400 = 8063^2 + 4720^2 .

It is a cyclic number.

It is not a de Polignac number, because 87290369 - 2⁸ = 87290113 is a prime.

It is a super-2 number, since 2×87290369² = 15239217040312322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87290069) 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, 24482 + ... + 27819.

It is an arithmetic number, because the mean of its divisors is an integer number (21836085).

Almost surely, 2^87290369 is an apocalyptic number.

It is an amenable number.

87290369 is a deficient number, since it is larger than the sum of its proper divisors (53971).

87290369 is a wasteful number, since it uses less digits than its factorization.

87290369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53970.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 87290369 is about 9342.9314992672. The cubic root of 87290369 is about 443.5971798312.

The spelling of 87290369 in words is "eighty-seven million, two hundred ninety thousand, three hundred sixty-nine".