70928639 has 4 divisors (see below), whose sum is σ = 71725680. Its totient is φ = 70131600.

The previous prime is 70928633. The next prime is 70928657. The reversal of 70928639 is 93682907.

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

It is a cyclic number.

It is not a de Polignac number, because 70928639 - 2¹² = 70924543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70928639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70928633) 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, 398387 + ... + 398564.

It is an arithmetic number, because the mean of its divisors is an integer number (17931420).

Almost surely, 2^70928639 is an apocalyptic number.

70928639 is a deficient number, since it is larger than the sum of its proper divisors (797041).

70928639 is an equidigital number, since it uses as much as digits as its factorization.

70928639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797040.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 70928639 is about 8421.9142123391. The cubic root of 70928639 is about 413.9429993793.

The spelling of 70928639 in words is "seventy million, nine hundred twenty-eight thousand, six hundred thirty-nine".