72973478 has 4 divisors (see below), whose sum is σ = 109460220. Its totient is φ = 36486738.

The previous prime is 72973477. The next prime is 72973487. The reversal of 72973478 is 87437927.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72973477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18243368 + ... + 18243371.

It is an arithmetic number, because the mean of its divisors is an integer number (27365055).

Almost surely, 2^72973478 is an apocalyptic number.

72973478 is a deficient number, since it is larger than the sum of its proper divisors (36486742).

72973478 is a wasteful number, since it uses less digits than its factorization.

72973478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36486741.

The product of its digits is 592704, while the sum is 47.

The square root of 72973478 is about 8542.4515216652. The cubic root of 72973478 is about 417.8832996104.

The spelling of 72973478 in words is "seventy-two million, nine hundred seventy-three thousand, four hundred seventy-eight".