78505452 has 36 divisors (see below), whose sum is σ = 199490200. Its totient is φ = 26030592.

The previous prime is 78505451. The next prime is 78505457. The reversal of 78505452 is 25450587.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78505451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1299 + ... + 12597.

Almost surely, 2^78505452 is an apocalyptic number.

It is an amenable number.

78505452 is an abundant number, since it is smaller than the sum of its proper divisors (120984748).

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

78505452 is a wasteful number, since it uses less digits than its factorization.

78505452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11502 (or 11497 counting only the distinct ones).

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

The square root of 78505452 is about 8860.3302421524. The cubic root of 78505452 is about 428.1867979559.

The spelling of 78505452 in words is "seventy-eight million, five hundred five thousand, four hundred fifty-two".