621901992 has 32 divisors (see below), whose sum is σ = 1555368480. Its totient is φ = 207218880.

The previous prime is 621901937. The next prime is 621901999. The reversal of 621901992 is 299109126.

It is a self number, because there is not a number n which added to its sum of digits gives 621901992.

It is not an unprimeable number, because it can be changed into a prime (621901999) 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, 108642 + ... + 114222.

It is an arithmetic number, because the mean of its divisors is an integer number (48605265).

Almost surely, 2^621901992 is an apocalyptic number.

It is an amenable number.

621901992 is an abundant number, since it is smaller than the sum of its proper divisors (933466488).

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

621901992 is a wasteful number, since it uses less digits than its factorization.

621901992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10233 (or 10229 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 621901992 is about 24937.9628678848. The cubic root of 621901992 is about 853.5729609962.

The spelling of 621901992 in words is "six hundred twenty-one million, nine hundred one thousand, nine hundred ninety-two".