87781092 has 24 divisors (see below), whose sum is σ = 234083136. Its totient is φ = 25080288.

The previous prime is 87781069. The next prime is 87781093. The reversal of 87781092 is 29018778.

It is a super-2 number, since 2×87781092² = 15411040225424928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (87781093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522423 + ... + 522590.

It is an arithmetic number, because the mean of its divisors is an integer number (9753464).

Almost surely, 2^87781092 is an apocalyptic number.

It is an amenable number.

87781092 is an abundant number, since it is smaller than the sum of its proper divisors (146302044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87781092 is a wasteful number, since it uses less digits than its factorization.

87781092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045027 (or 1045025 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 87781092 is about 9369.1564188031. The cubic root of 87781092 is about 444.4268883528.

It can be divided in two parts, 8778 and 1092, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 87781092 in words is "eighty-seven million, seven hundred eighty-one thousand, ninety-two".