87861493 has 4 divisors (see below), whose sum is σ = 87892128. Its totient is φ = 87830860.

The previous prime is 87861469. The next prime is 87861497. The reversal of 87861493 is 39416878.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87861493 - 2⁵ = 87861461 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 (87861497) 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, 10513 + ... + 16918.

It is an arithmetic number, because the mean of its divisors is an integer number (21973032).

Almost surely, 2^87861493 is an apocalyptic number.

It is an amenable number.

87861493 is a deficient number, since it is larger than the sum of its proper divisors (30635).

87861493 is a wasteful number, since it uses less digits than its factorization.

87861493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30634.

The product of its digits is 290304, while the sum is 46.

The square root of 87861493 is about 9373.4461645651. The cubic root of 87861493 is about 444.5625343543.

The spelling of 87861493 in words is "eighty-seven million, eight hundred sixty-one thousand, four hundred ninety-three".