66372426 has 48 divisors (see below), whose sum is σ = 152524800. Its totient is φ = 21393720.

The previous prime is 66372409. The next prime is 66372431. The reversal of 66372426 is 62427366.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51255 + ... + 52533.

It is an arithmetic number, because the mean of its divisors is an integer number (3177600).

Almost surely, 2^66372426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66372426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76262400).

66372426 is an abundant number, since it is smaller than the sum of its proper divisors (86152374).

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

66372426 is a wasteful number, since it uses less digits than its factorization.

66372426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352 (or 1315 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 66372426 is about 8146.9273962642. The cubic root of 66372426 is about 404.8827095195.

The spelling of 66372426 in words is "sixty-six million, three hundred seventy-two thousand, four hundred twenty-six".