72643278 has 32 divisors (see below), whose sum is σ = 156453120. Its totient is φ = 22401920.

The previous prime is 72643271. The next prime is 72643283. The reversal of 72643278 is 87234627.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72643271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18 + ... + 12053.

It is an arithmetic number, because the mean of its divisors is an integer number (4889160).

Almost surely, 2^72643278 is an apocalyptic number.

72643278 is an abundant number, since it is smaller than the sum of its proper divisors (83809842).

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

72643278 is a wasteful number, since it uses less digits than its factorization.

72643278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12152.

The product of its digits is 112896, while the sum is 39.

The square root of 72643278 is about 8523.1026040990. The cubic root of 72643278 is about 417.2520487394.

The spelling of 72643278 in words is "seventy-two million, six hundred forty-three thousand, two hundred seventy-eight".