72722440 has 32 divisors (see below), whose sum is σ = 187001280. Its totient is φ = 24933312.

The previous prime is 72722411. The next prime is 72722471. The reversal of 72722440 is 4422727.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 72722399 and 72722408.

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, 129582 + ... + 130141.

It is an arithmetic number, because the mean of its divisors is an integer number (5843790).

Almost surely, 2^72722440 is an apocalyptic number.

72722440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

72722440 is an abundant number, since it is smaller than the sum of its proper divisors (114278840).

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

72722440 is a wasteful number, since it uses less digits than its factorization.

72722440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259741 (or 259737 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 72722440 is about 8527.7453057652. The cubic root of 72722440 is about 417.4035585862.

The spelling of 72722440 in words is "seventy-two million, seven hundred twenty-two thousand, four hundred forty".