70099891 has 8 divisors (see below), whose sum is σ = 75119184. Its totient is φ = 65180160.

The previous prime is 70099879. The next prime is 70099901. The reversal of 70099891 is 19899007.

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

It is a cyclic number.

It is not a de Polignac number, because 70099891 - 2⁵ = 70099859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70099831) 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, 23430 + ... + 26251.

It is an arithmetic number, because the mean of its divisors is an integer number (9389898).

Almost surely, 2^70099891 is an apocalyptic number.

70099891 is a deficient number, since it is larger than the sum of its proper divisors (5019293).

70099891 is a wasteful number, since it uses less digits than its factorization.

70099891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49781.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 70099891 is about 8372.5677662232. The cubic root of 70099891 is about 412.3244745718.

It can be divided in two parts, 7009 and 9891, that added together give a square (16900 = 130²).

The spelling of 70099891 in words is "seventy million, ninety-nine thousand, eight hundred ninety-one".