346327721820 has 48 divisors (see below), whose sum is σ = 1077464025120. Its totient is φ = 92354059008.

The previous prime is 346327721819. The next prime is 346327721843. The reversal of 346327721820 is 28127723643.

346327721820 is a `hidden beast` number, since 3 + 4 + 632 + 7 + 7 + 2 + 1 + 8 + 2 + 0 = 666.

It is a super-2 number, since 2×346327721820² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 320673277 + ... + 320674356.

It is an arithmetic number, because the mean of its divisors is an integer number (22447167190).

Almost surely, 2^346327721820 is an apocalyptic number.

346327721820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

346327721820 is an abundant number, since it is smaller than the sum of its proper divisors (731136303300).

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

346327721820 is a wasteful number, since it uses less digits than its factorization.

346327721820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641347651 (or 641347643 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 346327721820 in words is "three hundred forty-six billion, three hundred twenty-seven million, seven hundred twenty-one thousand, eight hundred twenty".