70785640 has 32 divisors (see below), whose sum is σ = 167652000. Its totient is φ = 26823744.

The previous prime is 70785623. The next prime is 70785643. The reversal of 70785640 is 4658707.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 70785640.

It is not an unprimeable number, because it can be changed into a prime (70785643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45810 + ... + 47329.

It is an arithmetic number, because the mean of its divisors is an integer number (5239125).

Almost surely, 2^70785640 is an apocalyptic number.

It is an amenable number.

70785640 is an abundant number, since it is smaller than the sum of its proper divisors (96866360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70785640 is a wasteful number, since it uses less digits than its factorization.

70785640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93169 (or 93165 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 70785640 is about 8413.4202319865. The cubic root of 70785640 is about 413.6646291736.

The spelling of 70785640 in words is "seventy million, seven hundred eighty-five thousand, six hundred forty".