78145875 has 24 divisors (see below), whose sum is σ = 140872992. Its totient is φ = 41677200.

The previous prime is 78145871. The next prime is 78145883. The reversal of 78145875 is 57854187.

It is a happy number.

It is not a de Polignac number, because 78145875 - 2² = 78145871 is a prime.

It is a super-2 number, since 2×78145875² = 12213555559031250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78145875.

It is not an unprimeable number, because it can be changed into a prime (78145871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33607 + ... + 35856.

It is an arithmetic number, because the mean of its divisors is an integer number (5869708).

Almost surely, 2^78145875 is an apocalyptic number.

78145875 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78145875 is a deficient number, since it is larger than the sum of its proper divisors (62727117).

78145875 is a wasteful number, since it uses less digits than its factorization.

78145875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69484 (or 69471 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 78145875 is about 8840.0155542850. The cubic root of 78145875 is about 427.5320587428.

It can be divided in two parts, 7814 and 5875, that added together give a square (13689 = 117²).

The spelling of 78145875 in words is "seventy-eight million, one hundred forty-five thousand, eight hundred seventy-five".