77828472 has 32 divisors (see below), whose sum is σ = 216190800. Its totient is φ = 25942752.

The previous prime is 77828461. The next prime is 77828549. The reversal of 77828472 is 27482877.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179943 + ... + 180374.

Almost surely, 2^77828472 is an apocalyptic number.

77828472 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77828472 is an abundant number, since it is smaller than the sum of its proper divisors (138362328).

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

77828472 is a wasteful number, since it uses less digits than its factorization.

77828472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360332 (or 360322 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 77828472 is about 8822.0446609615. The cubic root of 77828472 is about 426.9524414707.

Subtracting from 77828472 its reverse (27482877), we obtain a triangular number (50345595 = T₁₀₀₃₄).

The spelling of 77828472 in words is "seventy-seven million, eight hundred twenty-eight thousand, four hundred seventy-two".