66947406 has 16 divisors (see below), whose sum is σ = 134264064. Its totient is φ = 22254264.

The previous prime is 66947369. The next prime is 66947437. The reversal of 66947406 is 60474966.

It is a congruent number.

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, 13000 + ... + 17403.

It is an arithmetic number, because the mean of its divisors is an integer number (8391504).

Almost surely, 2^66947406 is an apocalyptic number.

66947406 is an abundant number, since it is smaller than the sum of its proper divisors (67316658).

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

66947406 is a wasteful number, since it uses less digits than its factorization.

66947406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30775.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 66947406 is about 8182.1394512682. The cubic root of 66947406 is about 406.0485070697.

The spelling of 66947406 in words is "sixty-six million, nine hundred forty-seven thousand, four hundred six".