72422388 has 18 divisors (see below), whose sum is σ = 183067794. Its totient is φ = 24140784.

The previous prime is 72422369. The next prime is 72422393. The reversal of 72422388 is 88322427.

It can be written as a sum of positive squares in only one way, i.e., 72284004 + 138384 = 8502^2 + 372^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2011733 = 72422388 / (7 + 2 + 4 + 2 + 2 + 3 + 8 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005831 + ... + 1005902.

It is an arithmetic number, because the mean of its divisors is an integer number (10170433).

Almost surely, 2^72422388 is an apocalyptic number.

It is an amenable number.

72422388 is an abundant number, since it is smaller than the sum of its proper divisors (110645406).

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

72422388 is a wasteful number, since it uses less digits than its factorization.

72422388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011743 (or 2011738 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 72422388 is about 8510.1344290205. The cubic root of 72422388 is about 416.8286997183.

The spelling of 72422388 in words is "seventy-two million, four hundred twenty-two thousand, three hundred eighty-eight".