72255438 has 12 divisors (see below), whose sum is σ = 156553488. Its totient is φ = 24085140.

The previous prime is 72255433. The next prime is 72255439. The reversal of 72255438 is 83455227.

72255438 is a `hidden beast` number, since 72 + 2 + 554 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72255431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2007078 + ... + 2007113.

It is an arithmetic number, because the mean of its divisors is an integer number (13046124).

Almost surely, 2^72255438 is an apocalyptic number.

72255438 is an abundant number, since it is smaller than the sum of its proper divisors (84298050).

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

72255438 is a wasteful number, since it uses less digits than its factorization.

72255438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014199 (or 4014196 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 72255438 is about 8500.3198763341. The cubic root of 72255438 is about 416.5081584458.

The spelling of 72255438 in words is "seventy-two million, two hundred fifty-five thousand, four hundred thirty-eight".