621071616 has 72 divisors (see below), whose sum is σ = 1803249504. Its totient is φ = 188200960.

The previous prime is 621071593. The next prime is 621071621. The reversal of 621071616 is 616170126.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28311 + ... + 45206.

It is an arithmetic number, because the mean of its divisors is an integer number (25045132).

Almost surely, 2^621071616 is an apocalyptic number.

621071616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

621071616 is an abundant number, since it is smaller than the sum of its proper divisors (1182177888).

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

621071616 is a wasteful number, since it uses less digits than its factorization.

621071616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73547 (or 73533 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 621071616 is about 24921.3084728712. The cubic root of 621071616 is about 853.1928892129.

The spelling of 621071616 in words is "six hundred twenty-one million, seventy-one thousand, six hundred sixteen".