70890389 has 4 divisors (see below), whose sum is σ = 71553024. Its totient is φ = 70227756.

The previous prime is 70890361. The next prime is 70890401. The reversal of 70890389 is 98309807.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98309807 = 431 ⋅228097.

It is a cyclic number.

It is not a de Polignac number, because 70890389 - 2²⁴ = 54113173 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 (70890689) 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, 331157 + ... + 331370.

It is an arithmetic number, because the mean of its divisors is an integer number (17888256).

Almost surely, 2^70890389 is an apocalyptic number.

It is an amenable number.

70890389 is a deficient number, since it is larger than the sum of its proper divisors (662635).

70890389 is a wasteful number, since it uses less digits than its factorization.

70890389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662634.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 70890389 is about 8419.6430446902. The cubic root of 70890389 is about 413.8685763772.

The spelling of 70890389 in words is "seventy million, eight hundred ninety thousand, three hundred eighty-nine".