78542280 has 96 divisors (see below), whose sum is σ = 257774400. Its totient is φ = 20738688.

The previous prime is 78542279. The next prime is 78542287. The reversal of 78542280 is 8224587.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78542287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37501 + ... + 39539.

It is an arithmetic number, because the mean of its divisors is an integer number (2685150).

Almost surely, 2^78542280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78542280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128887200).

78542280 is an abundant number, since it is smaller than the sum of its proper divisors (179232120).

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

78542280 is a wasteful number, since it uses less digits than its factorization.

78542280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163 (or 2156 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 78542280 is about 8862.4082505829. The cubic root of 78542280 is about 428.2537436171.

It can be divided in two parts, 7854 and 2280, that multiplied together give a triangular number (17907120 = T₅₉₈₄).

The spelling of 78542280 in words is "seventy-eight million, five hundred forty-two thousand, two hundred eighty".