70640789 has 4 divisors (see below), whose sum is σ = 70837920. Its totient is φ = 70443660.

The previous prime is 70640783. The next prime is 70640837. The reversal of 70640789 is 98704607.

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: 98704607 = 317 ⋅311371.

It is a cyclic number.

It is not a de Polignac number, because 70640789 - 2²⁰ = 69592213 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 (70640783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98027 + ... + 98744.

It is an arithmetic number, because the mean of its divisors is an integer number (17709480).

Almost surely, 2^70640789 is an apocalyptic number.

It is an amenable number.

70640789 is a deficient number, since it is larger than the sum of its proper divisors (197131).

70640789 is a wasteful number, since it uses less digits than its factorization.

70640789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197130.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 70640789 is about 8404.8074933338. The cubic root of 70640789 is about 413.3822712752.

The spelling of 70640789 in words is "seventy million, six hundred forty thousand, seven hundred eighty-nine".