612156820 has 48 divisors (see below), whose sum is σ = 1476216000. Its totient is φ = 210885120.

The previous prime is 612156803. The next prime is 612156847. The reversal of 612156820 is 28651216.

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, 69045 + ... + 77404.

It is an arithmetic number, because the mean of its divisors is an integer number (30754500).

Almost surely, 2^612156820 is an apocalyptic number.

It is an amenable number.

612156820 is an abundant number, since it is smaller than the sum of its proper divisors (864059180).

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

612156820 is a wasteful number, since it uses less digits than its factorization.

612156820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146488 (or 146486 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 612156820 is about 24741.8030870832. The cubic root of 612156820 is about 849.0909867003.

The spelling of 612156820 in words is "six hundred twelve million, one hundred fifty-six thousand, eight hundred twenty".