77424308478 has 216 divisors, whose sum is σ = 193583570544. Its totient is φ = 22342320000.

The previous prime is 77424308471. The next prime is 77424308483. The reversal of 77424308478 is 87480342477.

77424308478 is a `hidden beast` number, since 77 + 424 + 3 + 0 + 84 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77424308471) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 148606858 + ... + 148607378.

It is an arithmetic number, because the mean of its divisors is an integer number (896220234).

Almost surely, 2^77424308478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77424308478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96791785272).

77424308478 is an abundant number, since it is smaller than the sum of its proper divisors (116159262066).

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

77424308478 is a wasteful number, since it uses less digits than its factorization.

77424308478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 54.

The spelling of 77424308478 in words is "seventy-seven billion, four hundred twenty-four million, three hundred eight thousand, four hundred seventy-eight".