78090345 has 32 divisors (see below), whose sum is σ = 140083200. Its totient is φ = 41271552.

The previous prime is 78090329. The next prime is 78090349. The reversal of 78090345 is 54309087.

It is not a de Polignac number, because 78090345 - 2⁴ = 78090329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78090349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12696 + ... + 17814.

It is an arithmetic number, because the mean of its divisors is an integer number (4377600).

Almost surely, 2^78090345 is an apocalyptic number.

It is an amenable number.

78090345 is a deficient number, since it is larger than the sum of its proper divisors (61992855).

78090345 is a wasteful number, since it uses less digits than its factorization.

78090345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5246 (or 5240 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 78090345 is about 8836.8741645448. The cubic root of 78090345 is about 427.4307674897.

It can be divided in two parts, 780 and 90345, that added together give a cube (91125 = 45³).

The spelling of 78090345 in words is "seventy-eight million, ninety thousand, three hundred forty-five".