72128278 has 16 divisors (see below), whose sum is σ = 112304880. Its totient is φ = 34701856.

The previous prime is 72128269. The next prime is 72128279. The reversal of 72128278 is 87282127.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72128279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16425 + ... + 20347.

It is an arithmetic number, because the mean of its divisors is an integer number (7019055).

Almost surely, 2^72128278 is an apocalyptic number.

72128278 is a deficient number, since it is larger than the sum of its proper divisors (40176602).

72128278 is a wasteful number, since it uses less digits than its factorization.

72128278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271.

The product of its digits is 25088, while the sum is 37.

The square root of 72128278 is about 8492.8368640873. The cubic root of 72128278 is about 416.2636819113.

The spelling of 72128278 in words is "seventy-two million, one hundred twenty-eight thousand, two hundred seventy-eight".