1621236456 has 96 divisors (see below), whose sum is σ = 5103259200. Its totient is φ = 455351040.

The previous prime is 1621236361. The next prime is 1621236517. The reversal of 1621236456 is 6546321261.

1621236456 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 2 + 3 + 645 + 6 = 666.

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 1621236456.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2476 + ... + 56996.

It is an arithmetic number, because the mean of its divisors is an integer number (53158950).

Almost surely, 2^1621236456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621236456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2551629600).

1621236456 is an abundant number, since it is smaller than the sum of its proper divisors (3482022744).

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

1621236456 is a wasteful number, since it uses less digits than its factorization.

1621236456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54599 (or 54592 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1621236456 is about 40264.5806634069. The cubic root of 1621236456 is about 1174.7590164615.

The spelling of 1621236456 in words is "one billion, six hundred twenty-one million, two hundred thirty-six thousand, four hundred fifty-six".