721127400840 has 192 divisors, whose sum is σ = 2921970879360. Its totient is φ = 149844648960.

The previous prime is 721127400811. The next prime is 721127400863. The reversal of 721127400840 is 48004721127.

721127400840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 721127400795 and 721127400804.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12979629 + ... + 13035068.

It is an arithmetic number, because the mean of its divisors is an integer number (15218598330).

Almost surely, 2^721127400840 is an apocalyptic number.

721127400840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

721127400840 is an abundant number, since it is smaller than the sum of its proper divisors (2200843478520).

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

721127400840 is a wasteful number, since it uses less digits than its factorization.

721127400840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26014732 (or 26014725 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The spelling of 721127400840 in words is "seven hundred twenty-one billion, one hundred twenty-seven million, four hundred thousand, eight hundred forty".