70724138 has 8 divisors (see below), whose sum is σ = 106189380. Its totient is φ = 35327680.

The previous prime is 70724123. The next prime is 70724179. The reversal of 70724138 is 83142707.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68343289 + 2380849 = 8267^2 + 1543^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14543 + ... + 18786.

Almost surely, 2^70724138 is an apocalyptic number.

70724138 is a deficient number, since it is larger than the sum of its proper divisors (35465242).

70724138 is a wasteful number, since it uses less digits than its factorization.

70724138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34392.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 70724138 is about 8409.7644437879. The cubic root of 70724138 is about 413.5447904899.

The spelling of 70724138 in words is "seventy million, seven hundred twenty-four thousand, one hundred thirty-eight".