78435790 has 32 divisors (see below), whose sum is σ = 150232320. Its totient is φ = 29382144.

The previous prime is 78435769. The next prime is 78435793. The reversal of 78435790 is 9753487.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78435793) 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, 36876 + ... + 38944.

It is an arithmetic number, because the mean of its divisors is an integer number (4694760).

Almost surely, 2^78435790 is an apocalyptic number.

78435790 is a deficient number, since it is larger than the sum of its proper divisors (71796530).

78435790 is a wasteful number, since it uses less digits than its factorization.

78435790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 78435790 is about 8856.3982521113. The cubic root of 78435790 is about 428.0601096174.

The spelling of 78435790 in words is "seventy-eight million, four hundred thirty-five thousand, seven hundred ninety".