78090478 has 16 divisors (see below), whose sum is σ = 118545840. Its totient is φ = 38578176.

The previous prime is 78090449. The next prime is 78090479. The reversal of 78090478 is 87409087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78090479) 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, 70900 + ... + 71992.

It is an arithmetic number, because the mean of its divisors is an integer number (7409115).

Almost surely, 2^78090478 is an apocalyptic number.

78090478 is a deficient number, since it is larger than the sum of its proper divisors (40455362).

78090478 is a wasteful number, since it uses less digits than its factorization.

78090478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 78090478 is about 8836.8816898270. The cubic root of 78090478 is about 427.4310101499.

The spelling of 78090478 in words is "seventy-eight million, ninety thousand, four hundred seventy-eight".