78640753 has 4 divisors (see below), whose sum is σ = 82779760. Its totient is φ = 74501748.

The previous prime is 78640733. The next prime is 78640777. The reversal of 78640753 is 35704687.

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-78640753 is a prime.

It is a super-3 number, since 3×78640753³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78640733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2069475 + ... + 2069512.

It is an arithmetic number, because the mean of its divisors is an integer number (20694940).

Almost surely, 2^78640753 is an apocalyptic number.

It is an amenable number.

78640753 is a deficient number, since it is larger than the sum of its proper divisors (4139007).

78640753 is a wasteful number, since it uses less digits than its factorization.

78640753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139006.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 78640753 is about 8867.9621672626. The cubic root of 78640753 is about 428.4326443693.

The spelling of 78640753 in words is "seventy-eight million, six hundred forty thousand, seven hundred fifty-three".