87926781 has 4 divisors (see below), whose sum is σ = 117235712. Its totient is φ = 58617852.

The previous prime is 87926767. The next prime is 87926789. The reversal of 87926781 is 18762978.

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 not a de Polignac number, because 87926781 - 2⁹ = 87926269 is a prime.

It is a super-2 number, since 2×87926781² = 15462237634043922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87926781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87926789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14654461 + ... + 14654466.

It is an arithmetic number, because the mean of its divisors is an integer number (29308928).

Almost surely, 2^87926781 is an apocalyptic number.

It is an amenable number.

87926781 is a deficient number, since it is larger than the sum of its proper divisors (29308931).

87926781 is a wasteful number, since it uses less digits than its factorization.

87926781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29308930.

The product of its digits is 338688, while the sum is 48.

The square root of 87926781 is about 9376.9281217252. The cubic root of 87926781 is about 444.6726220674.

The spelling of 87926781 in words is "eighty-seven million, nine hundred twenty-six thousand, seven hundred eighty-one".