77651328 has 128 divisors (see below), whose sum is σ = 225216000. Its totient is φ = 23611392.

The previous prime is 77651317. The next prime is 77651333. The reversal of 77651328 is 82315677.

It is a tau number, because it is divible by the number of its divisors (128).

Its product of digits (70560) is a multiple of the sum of its prime divisors (420).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211401 + ... + 211767.

It is an arithmetic number, because the mean of its divisors is an integer number (1759500).

Almost surely, 2^77651328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77651328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112608000).

77651328 is an abundant number, since it is smaller than the sum of its proper divisors (147564672).

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

77651328 is a wasteful number, since it uses less digits than its factorization.

77651328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 420 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 77651328 is about 8811.9990921470. Note that the first 3 decimals coincide. The cubic root of 77651328 is about 426.6282691140.

The spelling of 77651328 in words is "seventy-seven million, six hundred fifty-one thousand, three hundred twenty-eight".