78183280 has 80 divisors (see below), whose sum is σ = 209361600. Its totient is φ = 26597376.

The previous prime is 78183263. The next prime is 78183293. The reversal of 78183280 is 8238187.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×78183280² = 12225250543116800, which contains 22 as substring.

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, 82972 + ... + 83908.

It is an arithmetic number, because the mean of its divisors is an integer number (2617020).

Almost surely, 2^78183280 is an apocalyptic number.

78183280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78183280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104680800).

78183280 is an abundant number, since it is smaller than the sum of its proper divisors (131178320).

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

78183280 is a wasteful number, since it uses less digits than its factorization.

78183280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 78183280 is about 8842.1309648749. The cubic root of 78183280 is about 427.6002614718.

The spelling of 78183280 in words is "seventy-eight million, one hundred eighty-three thousand, two hundred eighty".