66458478 has 16 divisors (see below), whose sum is σ = 136008576. Its totient is φ = 21637560.

The previous prime is 66458461. The next prime is 66458479. The reversal of 66458478 is 87485466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66458479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128538 + ... + 129053.

It is an arithmetic number, because the mean of its divisors is an integer number (8500536).

Almost surely, 2^66458478 is an apocalyptic number.

66458478 is an abundant number, since it is smaller than the sum of its proper divisors (69550098).

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

66458478 is a wasteful number, since it uses less digits than its factorization.

66458478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257639.

The product of its digits is 1290240, while the sum is 48.

The square root of 66458478 is about 8152.2069404548. The cubic root of 66458478 is about 405.0576110698.

The spelling of 66458478 in words is "sixty-six million, four hundred fifty-eight thousand, four hundred seventy-eight".