77481440 has 24 divisors (see below), whose sum is σ = 183050280. Its totient is φ = 30992512.

The previous prime is 77481401. The next prime is 77481491. The reversal of 77481440 is 4418477.

It is a self number, because there is not a number n which added to its sum of digits gives 77481440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241970 + ... + 242289.

It is an arithmetic number, because the mean of its divisors is an integer number (7627095).

Almost surely, 2^77481440 is an apocalyptic number.

It is an amenable number.

77481440 is an abundant number, since it is smaller than the sum of its proper divisors (105568840).

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

77481440 is a wasteful number, since it uses less digits than its factorization.

77481440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484274 (or 484266 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 77481440 is about 8802.3542305454. The cubic root of 77481440 is about 426.3169117216.

The spelling of 77481440 in words is "seventy-seven million, four hundred eighty-one thousand, four hundred forty".