66424398 has 24 divisors (see below), whose sum is σ = 136689192. Its totient is φ = 21503664.

The previous prime is 66424381. The next prime is 66424411. The reversal of 66424398 is 89342466.

It is a happy number.

It is a super-3 number, since 3×66424398³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121161 + ... + 121707.

It is an arithmetic number, because the mean of its divisors is an integer number (5695383).

Almost surely, 2^66424398 is an apocalyptic number.

66424398 is an abundant number, since it is smaller than the sum of its proper divisors (70264794).

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

66424398 is an equidigital number, since it uses as much as digits as its factorization.

66424398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136 (or 589 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 66424398 is about 8150.1164408860. The cubic root of 66424398 is about 404.9883611958.

The spelling of 66424398 in words is "sixty-six million, four hundred twenty-four thousand, three hundred ninety-eight".