78863828 has 24 divisors (see below), whose sum is σ = 142153704. Its totient is φ = 38259200.

The previous prime is 78863819. The next prime is 78863831. The reversal of 78863828 is 82836887.

It can be written as a sum of positive squares in 4 ways, for example, as 3034564 + 75829264 = 1742^2 + 8708^2 .

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, 31088 + ... + 33528.

It is an arithmetic number, because the mean of its divisors is an integer number (5923071).

Almost surely, 2^78863828 is an apocalyptic number.

It is an amenable number.

78863828 is a deficient number, since it is larger than the sum of its proper divisors (63289876).

78863828 is a wasteful number, since it uses less digits than its factorization.

78863828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683 (or 2681 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 50.

The square root of 78863828 is about 8880.5308399892. The cubic root of 78863828 is about 428.8373640703.

It can be divided in two parts, 788 and 63828, that multiplied together give a square (50296464 = 7092²).

The spelling of 78863828 in words is "seventy-eight million, eight hundred sixty-three thousand, eight hundred twenty-eight".