84072780 has 72 divisors (see below), whose sum is σ = 278211024. Its totient is φ = 20380800.

The previous prime is 84072761. The next prime is 84072799. The reversal of 84072780 is 8727048.

It is an interprime number because it is at equal distance from previous prime (84072761) and next prime (84072799).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19251 + ... + 23210.

It is an arithmetic number, because the mean of its divisors is an integer number (3864042).

Almost surely, 2^84072780 is an apocalyptic number.

It is an amenable number.

84072780 is an abundant number, since it is smaller than the sum of its proper divisors (194138244).

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

84072780 is a wasteful number, since it uses less digits than its factorization.

84072780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42487 (or 42482 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 84072780 is about 9169.1210047638. The cubic root of 84072780 is about 438.0783621601.

The spelling of 84072780 in words is "eighty-four million, seventy-two thousand, seven hundred eighty".