621428457740 has 24 divisors (see below), whose sum is σ = 1309815269952. Its totient is φ = 247654143360.

The previous prime is 621428457721. The next prime is 621428457821. The reversal of 621428457740 is 47754824126.

It is a happy number.

It is a super-2 number, since 2×621428457740² (a number of 24 digits) contains 22 as substring.

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, 57321929 + ... + 57332768.

It is an arithmetic number, because the mean of its divisors is an integer number (54575636248).

Almost surely, 2^621428457740 is an apocalyptic number.

It is an amenable number.

621428457740 is an abundant number, since it is smaller than the sum of its proper divisors (688386812212).

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

621428457740 is a wasteful number, since it uses less digits than its factorization.

621428457740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114654977 (or 114654975 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 50.

The spelling of 621428457740 in words is "six hundred twenty-one billion, four hundred twenty-eight million, four hundred fifty-seven thousand, seven hundred forty".