78900578507 has 4 divisors (see below), whose sum is σ = 79248158376. Its totient is φ = 78552998640.

The previous prime is 78900578489. The next prime is 78900578509. The reversal of 78900578507 is 70587500987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70587500987 = 58109 ⋅1214743.

It is a cyclic number.

It is not a de Polignac number, because 78900578507 - 2⁶ = 78900578443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78900578509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173789594 + ... + 173790047.

It is an arithmetic number, because the mean of its divisors is an integer number (19812039594).

Almost surely, 2^78900578507 is an apocalyptic number.

78900578507 is a deficient number, since it is larger than the sum of its proper divisors (347579869).

78900578507 is a wasteful number, since it uses less digits than its factorization.

78900578507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347579868.

The product of its (nonzero) digits is 4939200, while the sum is 56.

The spelling of 78900578507 in words is "seventy-eight billion, nine hundred million, five hundred seventy-eight thousand, five hundred seven".