78453464544 has 768 divisors, whose sum is σ = 292260648960. Its totient is φ = 19926466560.

The previous prime is 78453464513. The next prime is 78453464561. The reversal of 78453464544 is 44546435487.

78453464544 is a `hidden beast` number, since 7 + 8 + 4 + 5 + 34 + 64 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 279193684 + ... + 279193964.

It is an arithmetic number, because the mean of its divisors is an integer number (380547720).

Almost surely, 2^78453464544 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 78453464544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146130324480).

78453464544 is an abundant number, since it is smaller than the sum of its proper divisors (213807184416).

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

78453464544 is a wasteful number, since it uses less digits than its factorization.

78453464544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 426 counting only the distinct ones).

The product of its digits is 25804800, while the sum is 54.

The spelling of 78453464544 in words is "seventy-eight billion, four hundred fifty-three million, four hundred sixty-four thousand, five hundred forty-four".