78280724418 has 16 divisors (see below), whose sum is σ = 168604637376. Its totient is φ = 24086376720.

The previous prime is 78280724387. The next prime is 78280724419. The reversal of 78280724418 is 81442708287.

It is a happy number.

It is a super-2 number, since 2×78280724418² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78280724419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501799438 + ... + 501799593.

It is an arithmetic number, because the mean of its divisors is an integer number (10537789836).

Almost surely, 2^78280724418 is an apocalyptic number.

78280724418 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

78280724418 is an abundant number, since it is smaller than the sum of its proper divisors (90323912958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78280724418 is a wasteful number, since it uses less digits than its factorization.

78280724418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003599049.

The product of its (nonzero) digits is 1605632, while the sum is 51.

The spelling of 78280724418 in words is "seventy-eight billion, two hundred eighty million, seven hundred twenty-four thousand, four hundred eighteen".