70747891 has 4 divisors (see below), whose sum is σ = 70775512. Its totient is φ = 70720272.

The previous prime is 70747871. The next prime is 70747933. The reversal of 70747891 is 19874707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19874707 = 937 ⋅21211.

It is a cyclic number.

It is not a de Polignac number, because 70747891 - 2¹³ = 70739699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70747801) 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, 9525 + ... + 15238.

It is an arithmetic number, because the mean of its divisors is an integer number (17693878).

Almost surely, 2^70747891 is an apocalyptic number.

70747891 is a deficient number, since it is larger than the sum of its proper divisors (27621).

70747891 is a wasteful number, since it uses less digits than its factorization.

70747891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27620.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 70747891 is about 8411.1765526590. The cubic root of 70747891 is about 413.5910822285.

The spelling of 70747891 in words is "seventy million, seven hundred forty-seven thousand, eight hundred ninety-one".