77146428 has 48 divisors (see below), whose sum is σ = 183343104. Its totient is φ = 25244160.

The previous prime is 77146417. The next prime is 77146469. The reversal of 77146428 is 82464177.

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, 222151 + ... + 222497.

It is an arithmetic number, because the mean of its divisors is an integer number (3819648).

Almost surely, 2^77146428 is an apocalyptic number.

It is an amenable number.

77146428 is an abundant number, since it is smaller than the sum of its proper divisors (106196676).

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

77146428 is a wasteful number, since it uses less digits than its factorization.

77146428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 640 counting only the distinct ones).

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

The square root of 77146428 is about 8783.3039341696. The cubic root of 77146428 is about 425.7015918063.

The spelling of 77146428 in words is "seventy-seven million, one hundred forty-six thousand, four hundred twenty-eight".