70991892 has 72 divisors (see below), whose sum is σ = 189693504. Its totient is φ = 22340736.

The previous prime is 70991873. The next prime is 70991909. The reversal of 70991892 is 29819907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68208 + ... + 69240.

It is an arithmetic number, because the mean of its divisors is an integer number (2634632).

Almost surely, 2^70991892 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70991892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94846752).

70991892 is an abundant number, since it is smaller than the sum of its proper divisors (118701612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70991892 is a wasteful number, since it uses less digits than its factorization.

70991892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 70991892 is about 8425.6686381557. The cubic root of 70991892 is about 414.0660120182.

The spelling of 70991892 in words is "seventy million, nine hundred ninety-one thousand, eight hundred ninety-two".