70891989 has 24 divisors (see below), whose sum is σ = 114763968. Its totient is φ = 38123520.

The previous prime is 70891973. The next prime is 70892011. The reversal of 70891989 is 98919807.

It is not a de Polignac number, because 70891989 - 2⁴ = 70891973 is a prime.

It is a super-2 number, since 2×70891989² = 10051348208752242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70891939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229 + ... + 11909.

It is an arithmetic number, because the mean of its divisors is an integer number (4781832).

Almost surely, 2^70891989 is an apocalyptic number.

It is an amenable number.

70891989 is a deficient number, since it is larger than the sum of its proper divisors (43871979).

70891989 is a wasteful number, since it uses less digits than its factorization.

70891989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11725 (or 11708 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 70891989 is about 8419.7380600586. The cubic root of 70891989 is about 413.8716900327.

The spelling of 70891989 in words is "seventy million, eight hundred ninety-one thousand, nine hundred eighty-nine".