66469440 has 56 divisors (see below), whose sum is σ = 211043520. Its totient is φ = 17724928.

The previous prime is 66469433. The next prime is 66469451. The reversal of 66469440 is 4496466.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33660 + ... + 35579.

Almost surely, 2^66469440 is an apocalyptic number.

66469440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66469440 is an abundant number, since it is smaller than the sum of its proper divisors (144574080).

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

66469440 is a wasteful number, since it uses less digits than its factorization.

66469440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69259 (or 69249 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 66469440 is about 8152.8792460087. The cubic root of 66469440 is about 405.0798806009.

The spelling of 66469440 in words is "sixty-six million, four hundred sixty-nine thousand, four hundred forty".