72281878 has 24 divisors (see below), whose sum is σ = 112539672. Its totient is φ = 34809984.

The previous prime is 72281873. The next prime is 72281887. The reversal of 72281878 is 87818227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72281873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 745126 + ... + 745222.

It is an arithmetic number, because the mean of its divisors is an integer number (4689153).

Almost surely, 2^72281878 is an apocalyptic number.

72281878 is a deficient number, since it is larger than the sum of its proper divisors (40257794).

72281878 is an equidigital number, since it uses as much as digits as its factorization.

72281878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 249 counting only the distinct ones).

The product of its digits is 100352, while the sum is 43.

The square root of 72281878 is about 8501.8749696758. The cubic root of 72281878 is about 416.5589556962.

The spelling of 72281878 in words is "seventy-two million, two hundred eighty-one thousand, eight hundred seventy-eight".