78900578506 has 8 divisors (see below), whose sum is σ = 119680653060. Its totient is φ = 39007027488.

The previous prime is 78900578489. The next prime is 78900578509. The reversal of 78900578506 is 60587500987.

It can be written as a sum of positive squares in 2 ways, for example, as 68207157225 + 10693421281 = 261165^2 + 103409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (78900578509) 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, 221630661 + ... + 221631016.

Almost surely, 2^78900578506 is an apocalyptic number.

78900578506 is a deficient number, since it is larger than the sum of its proper divisors (40780074554).

78900578506 is a wasteful number, since it uses less digits than its factorization.

78900578506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443261768.

The product of its (nonzero) digits is 4233600, while the sum is 55.

The spelling of 78900578506 in words is "seventy-eight billion, nine hundred million, five hundred seventy-eight thousand, five hundred six".