66670400 has 42 divisors (see below), whose sum is σ = 164054790. Its totient is φ = 26667520.

The previous prime is 66670327. The next prime is 66670421. The reversal of 66670400 is 407666.

It can be written as a sum of positive squares in 3 ways, for example, as 215296 + 66455104 = 464^2 + 8152^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19235 + ... + 22434.

Almost surely, 2^66670400 is an apocalyptic number.

It is an amenable number.

66670400 is an abundant number, since it is smaller than the sum of its proper divisors (97384390).

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

66670400 is a wasteful number, since it uses less digits than its factorization.

66670400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41691 (or 41676 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66670400 is about 8165.1944251193. The cubic root of 66670400 is about 405.4877018594.

The spelling of 66670400 in words is "sixty-six million, six hundred seventy thousand, four hundred".