78121507248 has 120 divisors (see below), whose sum is σ = 220463406800. Its totient is φ = 25822789632.

The previous prime is 78121507223. The next prime is 78121507273. The reversal of 78121507248 is 84270512187.

78121507248 is a `hidden beast` number, since 7 + 81 + 21 + 507 + 2 + 48 = 666.

It is an interprime number because it is at equal distance from previous prime (78121507223) and next prime (78121507273).

It is a super-2 number, since 2×78121507248² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22596336 + ... + 22599792.

Almost surely, 2^78121507248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78121507248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110231703400).

78121507248 is an abundant number, since it is smaller than the sum of its proper divisors (142341899552).

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

78121507248 is a wasteful number, since it uses less digits than its factorization.

78121507248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739 (or 4730 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The spelling of 78121507248 in words is "seventy-eight billion, one hundred twenty-one million, five hundred seven thousand, two hundred forty-eight".