78145790 has 16 divisors (see below), whose sum is σ = 141093360. Its totient is φ = 31162560.

The previous prime is 78145783. The next prime is 78145799. The reversal of 78145790 is 9754187.

It is a super-2 number, since 2×78145790² = 12213528989448200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78145799) 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, 8495 + ... + 15114.

It is an arithmetic number, because the mean of its divisors is an integer number (8818335).

Almost surely, 2^78145790 is an apocalyptic number.

78145790 is a deficient number, since it is larger than the sum of its proper divisors (62947570).

78145790 is a wasteful number, since it uses less digits than its factorization.

78145790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23947.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 78145790 is about 8840.0107465998. The cubic root of 78145790 is about 427.5319037326.

The spelling of 78145790 in words is "seventy-eight million, one hundred forty-five thousand, seven hundred ninety".