1621546056 has 48 divisors (see below), whose sum is σ = 4729512060. Its totient is φ = 498936960.

The previous prime is 1621546019. The next prime is 1621546057. The reversal of 1621546056 is 6506451261.

1621546056 is a `hidden beast` number, since 1 + 62 + 1 + 546 + 0 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1153689156 + 467856900 = 33966^2 + 21630^2 .

It is a super-2 number, since 2×1621546056² = 5258823223458310272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1621546056.

It is not an unprimeable number, because it can be changed into a prime (1621546057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 865275 + ... + 867146.

Almost surely, 2^1621546056 is an apocalyptic number.

It is an amenable number.

1621546056 is an abundant number, since it is smaller than the sum of its proper divisors (3107966004).

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

1621546056 is a wasteful number, since it uses less digits than its factorization.

1621546056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732446 (or 1732439 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1621546056 is about 40268.4250499073. The cubic root of 1621546056 is about 1174.8337911272.

The spelling of 1621546056 in words is "one billion, six hundred twenty-one million, five hundred forty-six thousand, fifty-six".