621146864 has 40 divisors (see below), whose sum is σ = 1302281232. Its totient is φ = 285304320.

The previous prime is 621146863. The next prime is 621146873. The reversal of 621146864 is 468641126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621146863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36812 + ... + 50964.

Almost surely, 2^621146864 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 621146864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (651140616).

621146864 is an abundant number, since it is smaller than the sum of its proper divisors (681134368).

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

621146864 is a wasteful number, since it uses less digits than its factorization.

621146864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14385 (or 14379 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 621146864 is about 24922.8181392073. The cubic root of 621146864 is about 853.2273449634.

The spelling of 621146864 in words is "six hundred twenty-one million, one hundred forty-six thousand, eight hundred sixty-four".