78645448 has 64 divisors (see below), whose sum is σ = 176832000. Its totient is φ = 32078592.

The previous prime is 78645443. The next prime is 78645449. The reversal of 78645448 is 84454687.

It is a super-2 number, since 2×78645448² = 12370212982241408, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78645398 and 78645407.

It is not an unprimeable number, because it can be changed into a prime (78645443) 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, 127990 + ... + 128602.

It is an arithmetic number, because the mean of its divisors is an integer number (2763000).

Almost surely, 2^78645448 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 78645448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88416000).

78645448 is an abundant number, since it is smaller than the sum of its proper divisors (98186552).

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

78645448 is a wasteful number, since it uses less digits than its factorization.

78645448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734 (or 730 counting only the distinct ones).

The product of its digits is 860160, while the sum is 46.

The square root of 78645448 is about 8868.2268802732. The cubic root of 78645448 is about 428.4411702763.

The spelling of 78645448 in words is "seventy-eight million, six hundred forty-five thousand, four hundred forty-eight".