77488320 has 224 divisors, whose sum is σ = 303141888. Its totient is φ = 16330752.

The previous prime is 77488303. The next prime is 77488321. The reversal of 77488320 is 2388477.

It is a tau number, because it is divible by the number of its divisors (224).

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

It is not an unprimeable number, because it can be changed into a prime (77488321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86917 + ... + 87803.

It is an arithmetic number, because the mean of its divisors is an integer number (1353312).

Almost surely, 2^77488320 is an apocalyptic number.

77488320 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 77488320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151570944).

77488320 is an abundant number, since it is smaller than the sum of its proper divisors (225653568).

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

77488320 is a wasteful number, since it uses less digits than its factorization.

77488320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 77488320 is about 8802.7450264108. The cubic root of 77488320 is about 426.3295296833.

The spelling of 77488320 in words is "seventy-seven million, four hundred eighty-eight thousand, three hundred twenty".