78298249828 has 12 divisors (see below), whose sum is σ = 137023997292. Its totient is φ = 39148536320.

The previous prime is 78298249789. The next prime is 78298249829. The reversal of 78298249828 is 82894289287.

It can be written as a sum of positive squares in 2 ways, for example, as 45195358464 + 33102891364 = 212592^2 + 181942^2 .

It is a super-2 number, since 2×78298249828² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78298249829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309876 + ... + 502612.

It is an arithmetic number, because the mean of its divisors is an integer number (11418666441).

Almost surely, 2^78298249828 is an apocalyptic number.

It is an amenable number.

78298249828 is a deficient number, since it is larger than the sum of its proper divisors (58725747464).

78298249828 is a wasteful number, since it uses less digits than its factorization.

78298249828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294302 (or 294300 counting only the distinct ones).

The product of its digits is 74317824, while the sum is 67.

The spelling of 78298249828 in words is "seventy-eight billion, two hundred ninety-eight million, two hundred forty-nine thousand, eight hundred twenty-eight".