77940408 has 128 divisors (see below), whose sum is σ = 242565120. Its totient is φ = 20321280.

The previous prime is 77940383. The next prime is 77940431. The reversal of 77940408 is 80404977.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277228 + ... + 277508.

It is an arithmetic number, because the mean of its divisors is an integer number (1895040).

Almost surely, 2^77940408 is an apocalyptic number.

77940408 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 77940408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121282560).

77940408 is an abundant number, since it is smaller than the sum of its proper divisors (164624712).

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

77940408 is a wasteful number, since it uses less digits than its factorization.

77940408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 77940408 is about 8828.3864890477. The cubic root of 77940408 is about 427.1570300732.

The spelling of 77940408 in words is "seventy-seven million, nine hundred forty thousand, four hundred eight".