66679428 has 12 divisors (see below), whose sum is σ = 155585360. Its totient is φ = 22226472.

The previous prime is 66679409. The next prime is 66679433. The reversal of 66679428 is 82497666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66679428² = 8892292236814368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2778298 + ... + 2778321.

Almost surely, 2^66679428 is an apocalyptic number.

It is an amenable number.

66679428 is an abundant number, since it is smaller than the sum of its proper divisors (88905932).

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

66679428 is a wasteful number, since it uses less digits than its factorization.

66679428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556626 (or 5556624 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 66679428 is about 8165.7472407613. The cubic root of 66679428 is about 405.5060037233.

The spelling of 66679428 in words is "sixty-six million, six hundred seventy-nine thousand, four hundred twenty-eight".