621405067478 has 48 divisors (see below), whose sum is σ = 1035564109776. Its totient is φ = 279367994880.

The previous prime is 621405067447. The next prime is 621405067499. The reversal of 621405067478 is 874760504126.

It is a super-2 number, since 2×621405067478² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8875826 + ... + 8945562.

It is an arithmetic number, because the mean of its divisors is an integer number (21574252287).

Almost surely, 2^621405067478 is an apocalyptic number.

621405067478 is a deficient number, since it is larger than the sum of its proper divisors (414159042298).

621405067478 is a wasteful number, since it uses less digits than its factorization.

621405067478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70449 (or 70436 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 621405067478 in words is "six hundred twenty-one billion, four hundred five million, sixty-seven thousand, four hundred seventy-eight".