78145305 has 32 divisors (see below), whose sum is σ = 143228928. Its totient is φ = 35640000.

The previous prime is 78145279. The next prime is 78145313. The reversal of 78145305 is 50354187.

It is not a de Polignac number, because 78145305 - 2⁵ = 78145273 is a prime.

It is a super-2 number, since 2×78145305² = 12213377387086050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78360 + ... + 79350.

It is an arithmetic number, because the mean of its divisors is an integer number (4475904).

Almost surely, 2^78145305 is an apocalyptic number.

It is an amenable number.

78145305 is a deficient number, since it is larger than the sum of its proper divisors (65083623).

78145305 is a wasteful number, since it uses less digits than its factorization.

78145305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 78145305 is about 8839.9833144639. The cubic root of 78145305 is about 427.5310192601.

The spelling of 78145305 in words is "seventy-eight million, one hundred forty-five thousand, three hundred five".