78225887284428 has 96 divisors (see below), whose sum is σ = 199524761465344. Its totient is φ = 23707488043008.

The previous prime is 78225887284399. The next prime is 78225887284439. The reversal of 78225887284428 is 82448278852287.

It is a super-2 number, since 2×78225887284428² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78225887284428.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89945676 + ... + 90811212.

Almost surely, 2^{78225887284428} is an apocalyptic number.

78225887284428 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78225887284428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99762380732672).

78225887284428 is an abundant number, since it is smaller than the sum of its proper divisors (121298874180916).

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

78225887284428 is a wasteful number, since it uses less digits than its factorization.

78225887284428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874271 (or 874269 counting only the distinct ones).

The product of its digits is 2055208960, while the sum is 75.

The spelling of 78225887284428 in words is "seventy-eight trillion, two hundred twenty-five billion, eight hundred eighty-seven million, two hundred eighty-four thousand, four hundred twenty-eight".