621166440 has 32 divisors (see below), whose sum is σ = 1863499680. Its totient is φ = 165644352.

The previous prime is 621166409. The next prime is 621166453. The reversal of 621166440 is 44661126.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 621166398 and 621166407.

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, 2588074 + ... + 2588313.

It is an arithmetic number, because the mean of its divisors is an integer number (58234365).

Almost surely, 2^621166440 is an apocalyptic number.

621166440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621166440 is an abundant number, since it is smaller than the sum of its proper divisors (1242333240).

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

621166440 is a wasteful number, since it uses less digits than its factorization.

621166440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5176401 (or 5176397 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 621166440 is about 24923.2108685859. The cubic root of 621166440 is about 853.2363082774.

The spelling of 621166440 in words is "six hundred twenty-one million, one hundred sixty-six thousand, four hundred forty".