70864891 has 4 divisors (see below), whose sum is σ = 75033432. Its totient is φ = 66696352.

The previous prime is 70864883. The next prime is 70864901. The reversal of 70864891 is 19846807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19846807 = 67 ⋅296221.

It is a cyclic number.

It is not a de Polignac number, because 70864891 - 2³ = 70864883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70864811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2084245 + ... + 2084278.

It is an arithmetic number, because the mean of its divisors is an integer number (18758358).

Almost surely, 2^70864891 is an apocalyptic number.

70864891 is a deficient number, since it is larger than the sum of its proper divisors (4168541).

70864891 is a wasteful number, since it uses less digits than its factorization.

70864891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4168540.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 70864891 is about 8418.1287112992. The cubic root of 70864891 is about 413.8189500617.

The spelling of 70864891 in words is "seventy million, eight hundred sixty-four thousand, eight hundred ninety-one".