72743278 has 4 divisors (see below), whose sum is σ = 109114920. Its totient is φ = 36371638.

The previous prime is 72743261. The next prime is 72743291. The reversal of 72743278 is 87234727.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 72743278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18185818 + ... + 18185821.

It is an arithmetic number, because the mean of its divisors is an integer number (27278730).

Almost surely, 2^72743278 is an apocalyptic number.

72743278 is a deficient number, since it is larger than the sum of its proper divisors (36371642).

72743278 is a wasteful number, since it uses less digits than its factorization.

72743278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36371641.

The product of its digits is 131712, while the sum is 40.

The square root of 72743278 is about 8528.9669948945. The cubic root of 72743278 is about 417.4434225985.

The spelling of 72743278 in words is "seventy-two million, seven hundred forty-three thousand, two hundred seventy-eight".