72451572390 has 32 divisors (see below), whose sum is σ = 193204193760. Its totient is φ = 19320419232.

The previous prime is 72451572377. The next prime is 72451572397. The reversal of 72451572390 is 9327515427.

It is a happy number.

72451572390 is a `hidden beast` number, since 7 + 2 + 45 + 1 + 572 + 39 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72451572397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134169309 + ... + 134169848.

It is an arithmetic number, because the mean of its divisors is an integer number (6037631055).

Almost surely, 2^72451572390 is an apocalyptic number.

72451572390 is an abundant number, since it is smaller than the sum of its proper divisors (120752621370).

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

72451572390 is a wasteful number, since it uses less digits than its factorization.

72451572390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268339173 (or 268339167 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 72451572390 in words is "seventy-two billion, four hundred fifty-one million, five hundred seventy-two thousand, three hundred ninety".