78452550 has 144 divisors (see below), whose sum is σ = 238859712. Its totient is φ = 18986400.

The previous prime is 78452531. The next prime is 78452551. The reversal of 78452550 is 5525487.

It is a happy number.

78452550 is a `hidden beast` number, since 7 + 84 + 525 + 50 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78452551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 133357 + ... + 133943.

It is an arithmetic number, because the mean of its divisors is an integer number (1658748).

Almost surely, 2^78452550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78452550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119429856).

78452550 is an abundant number, since it is smaller than the sum of its proper divisors (160407162).

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

78452550 is a wasteful number, since it uses less digits than its factorization.

78452550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 78452550 is about 8857.3444101491. The cubic root of 78452550 is about 428.0905964505.

The spelling of 78452550 in words is "seventy-eight million, four hundred fifty-two thousand, five hundred fifty".