70989681 has 32 divisors (see below), whose sum is σ = 116224000. Its totient is φ = 38419920.

The previous prime is 70989679. The next prime is 70989697. The reversal of 70989681 is 18698907.

It is a happy number.

It is not a de Polignac number, because 70989681 - 2¹ = 70989679 is a prime.

It is a super-2 number, since 2×70989681² = 10079069616963522, which contains 22 as substring.

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 70989681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70989601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17736 + ... + 21366.

It is an arithmetic number, because the mean of its divisors is an integer number (3632000).

Almost surely, 2^70989681 is an apocalyptic number.

It is an amenable number.

70989681 is a deficient number, since it is larger than the sum of its proper divisors (45234319).

70989681 is a wasteful number, since it uses less digits than its factorization.

70989681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674 (or 3660 counting only the distinct ones).

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

The square root of 70989681 is about 8425.5374309299. The cubic root of 70989681 is about 414.0617133608.

The spelling of 70989681 in words is "seventy million, nine hundred eighty-nine thousand, six hundred eighty-one".