66236440 has 32 divisors (see below), whose sum is σ = 149672160. Its totient is φ = 26380800.

The previous prime is 66236431. The next prime is 66236449. The reversal of 66236440 is 4463266.

It is an interprime number because it is at equal distance from previous prime (66236431) and next prime (66236449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66236449) 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, 6205 + ... + 13075.

It is an arithmetic number, because the mean of its divisors is an integer number (4677255).

Almost surely, 2^66236440 is an apocalyptic number.

It is an amenable number.

66236440 is an abundant number, since it is smaller than the sum of its proper divisors (83435720).

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

66236440 is a wasteful number, since it uses less digits than its factorization.

66236440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7123 (or 7119 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 66236440 is about 8138.5772712434. The cubic root of 66236440 is about 404.6060081435.

The spelling of 66236440 in words is "sixty-six million, two hundred thirty-six thousand, four hundred forty".