69640785 has 12 divisors (see below), whose sum is σ = 120710772. Its totient is φ = 37141728.

The previous prime is 69640783. The next prime is 69640817. The reversal of 69640785 is 58704696.

It can be written as a sum of positive squares in 2 ways, for example, as 43996689 + 25644096 = 6633^2 + 5064^2 .

It is not a de Polignac number, because 69640785 - 2¹ = 69640783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1547573 = 69640785 / (6 + 9 + 6 + 4 + 0 + 7 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 69640785.

It is not an unprimeable number, because it can be changed into a prime (69640783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 773742 + ... + 773831.

It is an arithmetic number, because the mean of its divisors is an integer number (10059231).

Almost surely, 2^69640785 is an apocalyptic number.

It is an amenable number.

69640785 is a deficient number, since it is larger than the sum of its proper divisors (51069987).

69640785 is a wasteful number, since it uses less digits than its factorization.

69640785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547584 (or 1547581 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 69640785 is about 8345.1054517004. The cubic root of 69640785 is about 411.4223551785.

The spelling of 69640785 in words is "sixty-nine million, six hundred forty thousand, seven hundred eighty-five".