78125779 has 8 divisors (see below), whose sum is σ = 81649152. Its totient is φ = 74613000.

The previous prime is 78125771. The next prime is 78125783. The reversal of 78125779 is 97752187.

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

It is a cyclic number.

It is not a de Polignac number, because 78125779 - 2³ = 78125771 is a prime.

It is a super-2 number, since 2×78125779² = 12207274688713682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78125771) 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, 15012 + ... + 19534.

It is an arithmetic number, because the mean of its divisors is an integer number (10206144).

Almost surely, 2^78125779 is an apocalyptic number.

78125779 is a deficient number, since it is larger than the sum of its proper divisors (3523373).

78125779 is a wasteful number, since it uses less digits than its factorization.

78125779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297.

The product of its digits is 246960, while the sum is 46.

The square root of 78125779 is about 8838.8788316166. The cubic root of 78125779 is about 427.4954075405.

The spelling of 78125779 in words is "seventy-eight million, one hundred twenty-five thousand, seven hundred seventy-nine".