78888890 has 16 divisors (see below), whose sum is σ = 142227360. Its totient is φ = 31505040.

The previous prime is 78888871. The next prime is 78888911. The reversal of 78888890 is 9888887.

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, 605 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (8889210).

Almost surely, 2^78888890 is an apocalyptic number.

78888890 is a deficient number, since it is larger than the sum of its proper divisors (63338470).

78888890 is a wasteful number, since it uses less digits than its factorization.

78888890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12637.

The product of its (nonzero) digits is 2064384, while the sum is 56.

The square root of 78888890 is about 8881.9417921984. The cubic root of 78888890 is about 428.8827857548.

The spelling of 78888890 in words is "seventy-eight million, eight hundred eighty-eight thousand, eight hundred ninety".