721650237144 has 64 divisors (see below), whose sum is σ = 1875182400000. Its totient is φ = 231154465920.

The previous prime is 721650237127. The next prime is 721650237149. The reversal of 721650237144 is 441732056127.

It is a junction number, because it is equal to n+sod(n) for n = 721650237096 and 721650237105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721650237149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2310144 + ... + 2603855.

It is an arithmetic number, because the mean of its divisors is an integer number (29299725000).

Almost surely, 2^721650237144 is an apocalyptic number.

It is an amenable number.

721650237144 is an abundant number, since it is smaller than the sum of its proper divisors (1153532162856).

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

721650237144 is a wasteful number, since it uses less digits than its factorization.

721650237144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914248 (or 4914244 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 721650237144 in words is "seven hundred twenty-one billion, six hundred fifty million, two hundred thirty-seven thousand, one hundred forty-four".