78089745 has 16 divisors (see below), whose sum is σ = 127062720. Its totient is φ = 40941504.

The previous prime is 78089689. The next prime is 78089747. The reversal of 78089745 is 54798087.

It is not a de Polignac number, because 78089745 - 2⁶ = 78089681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78089694 and 78089703.

It is not an unprimeable number, because it can be changed into a prime (78089747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43234 + ... + 45003.

It is an arithmetic number, because the mean of its divisors is an integer number (7941420).

Almost surely, 2^78089745 is an apocalyptic number.

It is an amenable number.

78089745 is a deficient number, since it is larger than the sum of its proper divisors (48972975).

78089745 is a wasteful number, since it uses less digits than its factorization.

78089745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88304.

The product of its (nonzero) digits is 564480, while the sum is 48.

The square root of 78089745 is about 8836.8402158238. The cubic root of 78089745 is about 427.4296727786.

It can be divided in two parts, 780 and 89745, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 78089745 in words is "seventy-eight million, eighty-nine thousand, seven hundred forty-five".