156812220 has 48 divisors (see below), whose sum is σ = 487861920. Its totient is φ = 41816448.

The previous prime is 156812209. The next prime is 156812231. The reversal of 156812220 is 22218651.

It is a happy number.

156812220 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (156812209) and next prime (156812231).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144657 + ... + 145736.

It is an arithmetic number, because the mean of its divisors is an integer number (10163790).

Almost surely, 2^156812220 is an apocalyptic number.

156812220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156812220 is an abundant number, since it is smaller than the sum of its proper divisors (331049700).

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

156812220 is a wasteful number, since it uses less digits than its factorization.

156812220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290411 (or 290403 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 156812220 is about 12522.4686064689. The cubic root of 156812220 is about 539.2539079067.

The spelling of 156812220 in words is "one hundred fifty-six million, eight hundred twelve thousand, two hundred twenty".