78499856 has 10 divisors (see below), whose sum is σ = 152093502. Its totient is φ = 39249920.

The previous prime is 78499847. The next prime is 78499859. The reversal of 78499856 is 65899487.

It can be written as a sum of positive squares in only one way, i.e., 78499600 + 256 = 8860^2 + 16^2 .

It is not an unprimeable number, because it can be changed into a prime (78499859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2453105 + ... + 2453136.

Almost surely, 2^78499856 is an apocalyptic number.

It is an amenable number.

78499856 is a deficient number, since it is larger than the sum of its proper divisors (73593646).

78499856 is a wasteful number, since it uses less digits than its factorization.

78499856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906249 (or 4906243 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 56.

The square root of 78499856 is about 8860.0144469408. The cubic root of 78499856 is about 428.1766237570.

It can be divided in two parts, 784 and 99856, that multiplied together give a square (78287104 = 8848²).

The spelling of 78499856 in words is "seventy-eight million, four hundred ninety-nine thousand, eight hundred fifty-six".