74779547388 has 288 divisors, whose sum is σ = 230826032640. Its totient is φ = 18624453120.

The previous prime is 74779547383. The next prime is 74779547389. The reversal of 74779547388 is 88374597747.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74779547383) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 61143745 + ... + 61144967.

It is an arithmetic number, because the mean of its divisors is an integer number (801479280).

Almost surely, 2^74779547388 is an apocalyptic number.

74779547388 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 74779547388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115413016320).

74779547388 is an abundant number, since it is smaller than the sum of its proper divisors (156046485252).

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

74779547388 is a wasteful number, since it uses less digits than its factorization.

74779547388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697 (or 1688 counting only the distinct ones).

The product of its digits is 331914240, while the sum is 69.

The spelling of 74779547388 in words is "seventy-four billion, seven hundred seventy-nine million, five hundred forty-seven thousand, three hundred eighty-eight".