72647842 has 16 divisors (see below), whose sum is σ = 114861240. Its totient is φ = 34408192.

The previous prime is 72647803. The next prime is 72647863. The reversal of 72647842 is 24874627.

It can be written as a sum of positive squares in 4 ways, for example, as 72607441 + 40401 = 8521^2 + 201^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72647795 and 72647804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8743 + ... + 14890.

Almost surely, 2^72647842 is an apocalyptic number.

72647842 is a deficient number, since it is larger than the sum of its proper divisors (42213398).

72647842 is a wasteful number, since it uses less digits than its factorization.

72647842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23717.

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

The square root of 72647842 is about 8523.3703427693. The cubic root of 72647842 is about 417.2607868660.

The spelling of 72647842 in words is "seventy-two million, six hundred forty-seven thousand, eight hundred forty-two".