70945639 has 16 divisors (see below), whose sum is σ = 80455680. Its totient is φ = 62203680.

The previous prime is 70945619. The next prime is 70945643. The reversal of 70945639 is 93654907.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70945639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70945595 and 70945604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70945619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10929 + ... + 16165.

It is an arithmetic number, because the mean of its divisors is an integer number (5028480).

Almost surely, 2^70945639 is an apocalyptic number.

70945639 is a deficient number, since it is larger than the sum of its proper divisors (9510041).

70945639 is a wasteful number, since it uses less digits than its factorization.

70945639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 70945639 is about 8422.9234236101. The cubic root of 70945639 is about 413.9760676808.

The spelling of 70945639 in words is "seventy million, nine hundred forty-five thousand, six hundred thirty-nine".