70427989 has 4 divisors (see below), whose sum is σ = 70535520. Its totient is φ = 70320460.

The previous prime is 70427969. The next prime is 70427999. The reversal of 70427989 is 98972407.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70427989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70427969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52777 + ... + 54094.

It is an arithmetic number, because the mean of its divisors is an integer number (17633880).

Almost surely, 2^70427989 is an apocalyptic number.

It is an amenable number.

70427989 is a deficient number, since it is larger than the sum of its proper divisors (107531).

70427989 is a wasteful number, since it uses less digits than its factorization.

70427989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107530.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 70427989 is about 8392.1385236422. The cubic root of 70427989 is about 412.9667595539.

The spelling of 70427989 in words is "seventy million, four hundred twenty-seven thousand, nine hundred eighty-nine".