72193878 has 12 divisors (see below), whose sum is σ = 156420108. Its totient is φ = 24064620.

The previous prime is 72193873. The next prime is 72193879. The reversal of 72193878 is 87839127.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72193873) 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, 2005368 + ... + 2005403.

It is an arithmetic number, because the mean of its divisors is an integer number (13035009).

Almost surely, 2^72193878 is an apocalyptic number.

72193878 is an abundant number, since it is smaller than the sum of its proper divisors (84226230).

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

72193878 is a wasteful number, since it uses less digits than its factorization.

72193878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010779 (or 4010776 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 72193878 is about 8496.6980645425. The cubic root of 72193878 is about 416.3898396588.

The spelling of 72193878 in words is "seventy-two million, one hundred ninety-three thousand, eight hundred seventy-eight".