72870442 has 8 divisors (see below), whose sum is σ = 111368196. Its totient is φ = 35747712.

The previous prime is 72870409. The next prime is 72870443. The reversal of 72870442 is 24407827.

It can be written as a sum of positive squares in 2 ways, for example, as 70913241 + 1957201 = 8421^2 + 1399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 72870398 and 72870407.

It is not an unprimeable number, because it can be changed into a prime (72870443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343623 + ... + 343834.

Almost surely, 2^72870442 is an apocalyptic number.

72870442 is a deficient number, since it is larger than the sum of its proper divisors (38497754).

72870442 is a wasteful number, since it uses less digits than its factorization.

72870442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687512.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 72870442 is about 8536.4185698687. The cubic root of 72870442 is about 417.6865280995.

The spelling of 72870442 in words is "seventy-two million, eight hundred seventy thousand, four hundred forty-two".