78145775 has 6 divisors (see below), whose sum is σ = 96900792. Its totient is φ = 62516600.

The previous prime is 78145747. The next prime is 78145783. The reversal of 78145775 is 57754187.

It is a de Polignac number, because none of the positive numbers 2^k-78145775 is a prime.

It is a super-2 number, since 2×78145775² = 12213524300701250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1562891 + ... + 1562940.

It is an arithmetic number, because the mean of its divisors is an integer number (16150132).

Almost surely, 2^78145775 is an apocalyptic number.

78145775 is a deficient number, since it is larger than the sum of its proper divisors (18755017).

78145775 is a wasteful number, since it uses less digits than its factorization.

78145775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125841 (or 3125836 counting only the distinct ones).

The product of its digits is 274400, while the sum is 44.

The square root of 78145775 is about 8840.0098981845. The cubic root of 78145775 is about 427.5318763778.

The spelling of 78145775 in words is "seventy-eight million, one hundred forty-five thousand, seven hundred seventy-five".