78550438 has 16 divisors (see below), whose sum is σ = 124922304. Its totient is φ = 36915840.

The previous prime is 78550393. The next prime is 78550441. The reversal of 78550438 is 83405587.

It is a self number, because there is not a number n which added to its sum of digits gives 78550438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44248 + ... + 45988.

It is an arithmetic number, because the mean of its divisors is an integer number (7807644).

Almost surely, 2^78550438 is an apocalyptic number.

78550438 is a deficient number, since it is larger than the sum of its proper divisors (46371866).

78550438 is a wasteful number, since it uses less digits than its factorization.

78550438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 78550438 is about 8862.8684972756. The cubic root of 78550438 is about 428.2685703367.

The spelling of 78550438 in words is "seventy-eight million, five hundred fifty thousand, four hundred thirty-eight".