77744380 has 60 divisors (see below), whose sum is σ = 190580040. Its totient is φ = 26638752.

The previous prime is 77744377. The next prime is 77744413. The reversal of 77744380 is 8344777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 47211 + ... + 48829.

It is an arithmetic number, because the mean of its divisors is an integer number (3176334).

Almost surely, 2^77744380 is an apocalyptic number.

77744380 is a gapful number since it is divisible by the number (70) 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 77744380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95290020).

77744380 is an abundant number, since it is smaller than the sum of its proper divisors (112835660).

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

77744380 is a wasteful number, since it uses less digits than its factorization.

77744380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 40.

The square root of 77744380 is about 8817.2773575520. The cubic root of 77744380 is about 426.7986150604.

The spelling of 77744380 in words is "seventy-seven million, seven hundred forty-four thousand, three hundred eighty".