78844890 has 16 divisors (see below), whose sum is σ = 189227808. Its totient is φ = 21025296.

The previous prime is 78844859. The next prime is 78844901. The reversal of 78844890 is 9844887.

It is a super-2 number, since 2×78844890² = 12433033358224200, which contains 22 as substring.

It is a Curzon 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, 1314052 + ... + 1314111.

It is an arithmetic number, because the mean of its divisors is an integer number (11826738).

Almost surely, 2^78844890 is an apocalyptic number.

78844890 is an abundant number, since it is smaller than the sum of its proper divisors (110382918).

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

78844890 is a wasteful number, since it uses less digits than its factorization.

78844890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628173.

The product of its (nonzero) digits is 516096, while the sum is 48.

The square root of 78844890 is about 8879.4645108813. The cubic root of 78844890 is about 428.8030349726.

The spelling of 78844890 in words is "seventy-eight million, eight hundred forty-four thousand, eight hundred ninety".