78453444 has 12 divisors (see below), whose sum is σ = 183058064. Its totient is φ = 26151144.

The previous prime is 78453443. The next prime is 78453469. The reversal of 78453444 is 44435487.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78453444² = 12309885750922272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78453443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3268882 + ... + 3268905.

Almost surely, 2^78453444 is an apocalyptic number.

It is an amenable number.

78453444 is an abundant number, since it is smaller than the sum of its proper divisors (104604620).

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

78453444 is a wasteful number, since it uses less digits than its factorization.

78453444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6537794 (or 6537792 counting only the distinct ones).

The product of its digits is 215040, while the sum is 39.

The square root of 78453444 is about 8857.3948765989. The cubic root of 78453444 is about 428.0922225354.

The spelling of 78453444 in words is "seventy-eight million, four hundred fifty-three thousand, four hundred forty-four".