66064440 has 64 divisors (see below), whose sum is σ = 213444000. Its totient is φ = 16261632.

The previous prime is 66064429. The next prime is 66064451. The reversal of 66064440 is 4446066.

66064440 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (66064429) and next prime (66064451).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66064398 and 66064407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19615 + ... + 22734.

Almost surely, 2^66064440 is an apocalyptic number.

66064440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66064440 is an abundant number, since it is smaller than the sum of its proper divisors (147379560).

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

66064440 is a wasteful number, since it uses less digits than its factorization.

66064440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42376 (or 42372 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 66064440 is about 8128.0034448812. The cubic root of 66064440 is about 404.2554832737.

The spelling of 66064440 in words is "sixty-six million, sixty-four thousand, four hundred forty".