77130828 has 18 divisors (see below), whose sum is σ = 194969684. Its totient is φ = 25710264.

The previous prime is 77130817. The next prime is 77130913. The reversal of 77130828 is 82803177.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2142523 = 77130828 / (7 + 7 + 1 + 3 + 0 + 8 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 77130792 and 77130801.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1071226 + ... + 1071297.

Almost surely, 2^77130828 is an apocalyptic number.

It is an amenable number.

77130828 is an abundant number, since it is smaller than the sum of its proper divisors (117838856).

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

77130828 is a wasteful number, since it uses less digits than its factorization.

77130828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142533 (or 2142528 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 77130828 is about 8782.4158407582. The cubic root of 77130828 is about 425.6728957596.

The spelling of 77130828 in words is "seventy-seven million, one hundred thirty thousand, eight hundred twenty-eight".