72478642 has 4 divisors (see below), whose sum is σ = 108717966. Its totient is φ = 36239320.

The previous prime is 72478639. The next prime is 72478687. The reversal of 72478642 is 24687427.

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

It can be written as a sum of positive squares in only one way, i.e., 71757841 + 720801 = 8471^2 + 849^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72478595 and 72478604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18119659 + ... + 18119662.

Almost surely, 2^72478642 is an apocalyptic number.

72478642 is a deficient number, since it is larger than the sum of its proper divisors (36239324).

72478642 is a wasteful number, since it uses less digits than its factorization.

72478642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36239323.

The product of its digits is 150528, while the sum is 40.

The square root of 72478642 is about 8513.4389056362. The cubic root of 72478642 is about 416.9365955122.

The spelling of 72478642 in words is "seventy-two million, four hundred seventy-eight thousand, six hundred forty-two".