70249991 has 8 divisors (see below), whose sum is σ = 80707584. Its totient is φ = 59897880.

The previous prime is 70249961. The next prime is 70249997. The reversal of 70249991 is 19994207.

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 70249991 - 2²² = 66055687 is a prime.

It is a super-2 number, since 2×70249991² = 9870122471000162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70249997) 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, 24935 + ... + 27608.

It is an arithmetic number, because the mean of its divisors is an integer number (10088448).

Almost surely, 2^70249991 is an apocalyptic number.

70249991 is a deficient number, since it is larger than the sum of its proper divisors (10457593).

70249991 is a wasteful number, since it uses less digits than its factorization.

70249991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52741.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 70249991 is about 8381.5267702251. The cubic root of 70249991 is about 412.6185586362.

The spelling of 70249991 in words is "seventy million, two hundred forty-nine thousand, nine hundred ninety-one".