621234039978 has 24 divisors (see below), whose sum is σ = 1356605572608. Its totient is φ = 205447477032.

The previous prime is 621234039953. The next prime is 621234039989. The reversal of 621234039978 is 879930432126.

621234039978 is a `hidden beast` number, since 6 + 212 + 34 + 0 + 399 + 7 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135875676 + ... + 135880247.

It is an arithmetic number, because the mean of its divisors is an integer number (56525232192).

Almost surely, 2^621234039978 is an apocalyptic number.

621234039978 is an abundant number, since it is smaller than the sum of its proper divisors (735371532630).

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

621234039978 is a wasteful number, since it uses less digits than its factorization.

621234039978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271756058 (or 271756055 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 621234039978 in words is "six hundred twenty-one billion, two hundred thirty-four million, thirty-nine thousand, nine hundred seventy-eight".