66463578 has 40 divisors (see below), whose sum is σ = 150752448. Its totient is φ = 21883176.

The previous prime is 66463571. The next prime is 66463601. The reversal of 66463578 is 87536466.

66463578 is a `hidden beast` number, since 6 + 6 + 4 + 635 + 7 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (725760) is a multiple of the sum of its prime factors (5040).

It is not an unprimeable number, because it can be changed into a prime (66463571) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10975 + ... + 15917.

Almost surely, 2^66463578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66463578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75376224).

66463578 is an abundant number, since it is smaller than the sum of its proper divisors (84288870).

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

66463578 is a wasteful number, since it uses less digits than its factorization.

66463578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5040 (or 5031 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 66463578 is about 8152.5197331868. The cubic root of 66463578 is about 405.0679721305.

The spelling of 66463578 in words is "sixty-six million, four hundred sixty-three thousand, five hundred seventy-eight".