78452540 has 48 divisors (see below), whose sum is σ = 177871680. Its totient is φ = 28976640.

The previous prime is 78452531. The next prime is 78452551. The reversal of 78452540 is 4525487.

It is a self number, because there is not a number n which added to its sum of digits gives 78452540.

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, 10400 + ... + 16280.

It is an arithmetic number, because the mean of its divisors is an integer number (3705660).

Almost surely, 2^78452540 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 78452540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88935840).

78452540 is an abundant number, since it is smaller than the sum of its proper divisors (99419140).

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

78452540 is a wasteful number, since it uses less digits than its factorization.

78452540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5942 (or 5940 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 78452540 is about 8857.3438456458. The cubic root of 78452540 is about 428.0905782615.

The spelling of 78452540 in words is "seventy-eight million, four hundred fifty-two thousand, five hundred forty".