28451223816378 has 32 divisors (see below), whose sum is σ = 62079327770112. Its totient is φ = 8621037092400.

The previous prime is 28451223816377. The next prime is 28451223816397. The reversal of 28451223816378 is 87361832215482.

It is a super-2 number, since 2×28451223816378² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28451223816377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12596158 + ... + 14682153.

It is an arithmetic number, because the mean of its divisors is an integer number (1939978992816).

Almost surely, 2^{28451223816378} is an apocalyptic number.

28451223816378 is an abundant number, since it is smaller than the sum of its proper divisors (33628103953734).

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

28451223816378 is a wasteful number, since it uses less digits than its factorization.

28451223816378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27294130.

The product of its digits is 30965760, while the sum is 60.

The spelling of 28451223816378 in words is "twenty-eight trillion, four hundred fifty-one billion, two hundred twenty-three million, eight hundred sixteen thousand, three hundred seventy-eight".