73640770457 has 4 divisors (see below), whose sum is σ = 73749546276. Its totient is φ = 73531994640.

The previous prime is 73640770403. The next prime is 73640770471. The reversal of 73640770457 is 75407704637.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37880447641 + 35760322816 = 194629^2 + 189104^2 .

It is a cyclic number.

It is not a de Polignac number, because 73640770457 - 2²⁶ = 73573661593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73640770487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54386894 + ... + 54388247.

It is an arithmetic number, because the mean of its divisors is an integer number (18437386569).

Almost surely, 2^73640770457 is an apocalyptic number.

It is an amenable number.

73640770457 is a deficient number, since it is larger than the sum of its proper divisors (108775819).

73640770457 is a wasteful number, since it uses less digits than its factorization.

73640770457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108775818.

The product of its (nonzero) digits is 3457440, while the sum is 50.

The spelling of 73640770457 in words is "seventy-three billion, six hundred forty million, seven hundred seventy thousand, four hundred fifty-seven".