77898820 has 48 divisors (see below), whose sum is σ = 167142528. Its totient is φ = 30490880.

The previous prime is 77898809. The next prime is 77898827. The reversal of 77898820 is 2889877.

It is not an unprimeable number, because it can be changed into a prime (77898827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277080 + ... + 277360.

It is an arithmetic number, because the mean of its divisors is an integer number (3482136).

Almost surely, 2^77898820 is an apocalyptic number.

It is an amenable number.

77898820 is an abundant number, since it is smaller than the sum of its proper divisors (89243708).

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

77898820 is a wasteful number, since it uses less digits than its factorization.

77898820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 77898820 is about 8826.0308179838. The cubic root of 77898820 is about 427.0810413890.

The spelling of 77898820 in words is "seventy-seven million, eight hundred ninety-eight thousand, eight hundred twenty".