84720156 has 12 divisors (see below), whose sum is σ = 197680392. Its totient is φ = 28240048.

The previous prime is 84720143. The next prime is 84720157. The reversal of 84720156 is 65102748.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84720157) 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, 3529995 + ... + 3530018.

It is an arithmetic number, because the mean of its divisors is an integer number (16473366).

Almost surely, 2^84720156 is an apocalyptic number.

It is an amenable number.

84720156 is an abundant number, since it is smaller than the sum of its proper divisors (112960236).

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

84720156 is a wasteful number, since it uses less digits than its factorization.

84720156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060020 (or 7060018 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 84720156 is about 9204.3552734561. The cubic root of 84720156 is about 439.1999165563.

The spelling of 84720156 in words is "eighty-four million, seven hundred twenty thousand, one hundred fifty-six".