78546820 has 24 divisors (see below), whose sum is σ = 179944128. Its totient is φ = 28562400.

The previous prime is 78546781. The next prime is 78546821. The reversal of 78546820 is 2864587.

It is a super-2 number, since 2×78546820² = 12339205864224800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78546821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178296 + ... + 178735.

It is an arithmetic number, because the mean of its divisors is an integer number (7497672).

Almost surely, 2^78546820 is an apocalyptic number.

It is an amenable number.

78546820 is an abundant number, since it is smaller than the sum of its proper divisors (101397308).

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

78546820 is a wasteful number, since it uses less digits than its factorization.

78546820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357051 (or 357049 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 78546820 is about 8862.6643849353. The cubic root of 78546820 is about 428.2619949459.

The spelling of 78546820 in words is "seventy-eight million, five hundred forty-six thousand, eight hundred twenty".