70719391 has 4 divisors (see below), whose sum is σ = 72364072. Its totient is φ = 69074712.

The previous prime is 70719377. The next prime is 70719409. The reversal of 70719391 is 19391707.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70719391 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 70719391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70719361) 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, 822276 + ... + 822361.

It is an arithmetic number, because the mean of its divisors is an integer number (18091018).

Almost surely, 2^70719391 is an apocalyptic number.

70719391 is a deficient number, since it is larger than the sum of its proper divisors (1644681).

70719391 is a wasteful number, since it uses less digits than its factorization.

70719391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644680.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 70719391 is about 8409.4822076035. The cubic root of 70719391 is about 413.5355379155.

The spelling of 70719391 in words is "seventy million, seven hundred nineteen thousand, three hundred ninety-one".