72742278 has 32 divisors (see below), whose sum is σ = 166832640. Its totient is φ = 20712960.

The previous prime is 72742253. The next prime is 72742289. The reversal of 72742278 is 87224727.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10278 + ... + 15846.

It is an arithmetic number, because the mean of its divisors is an integer number (5213520).

Almost surely, 2^72742278 is an apocalyptic number.

72742278 is an abundant number, since it is smaller than the sum of its proper divisors (94090362).

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

72742278 is a wasteful number, since it uses less digits than its factorization.

72742278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5892.

The product of its digits is 87808, while the sum is 39.

The square root of 72742278 is about 8528.9083709464. The cubic root of 72742278 is about 417.4415097283.

The spelling of 72742278 in words is "seventy-two million, seven hundred forty-two thousand, two hundred seventy-eight".