70869891 has 8 divisors (see below), whose sum is σ = 96690880. Its totient is φ = 46147752.

The previous prime is 70869833. The next prime is 70869893. The reversal of 70869891 is 19896807.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70869891 - 2²⁶ = 3761027 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 70869891.

It is not an unprimeable number, because it can be changed into a prime (70869893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274561 + ... + 274818.

It is an arithmetic number, because the mean of its divisors is an integer number (12086360).

Almost surely, 2^70869891 is an apocalyptic number.

70869891 is a deficient number, since it is larger than the sum of its proper divisors (25820989).

70869891 is a wasteful number, since it uses less digits than its factorization.

70869891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549425.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 70869891 is about 8418.4256841763. The cubic root of 70869891 is about 413.8286824132.

The spelling of 70869891 in words is "seventy million, eight hundred sixty-nine thousand, eight hundred ninety-one".