87722780 has 24 divisors (see below), whose sum is σ = 188712720. Its totient is φ = 34232960.

The previous prime is 87722749. The next prime is 87722797. The reversal of 87722780 is 8722778.

It is a super-2 number, since 2×87722780² = 15390572261856800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52670 + ... + 54309.

It is an arithmetic number, because the mean of its divisors is an integer number (7863030).

Almost surely, 2^87722780 is an apocalyptic number.

It is an amenable number.

87722780 is an abundant number, since it is smaller than the sum of its proper divisors (100989940).

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

87722780 is a wasteful number, since it uses less digits than its factorization.

87722780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107029 (or 107027 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 87722780 is about 9366.0439887927. The cubic root of 87722780 is about 444.3284572796.

The spelling of 87722780 in words is "eighty-seven million, seven hundred twenty-two thousand, seven hundred eighty".