66928413 has 8 divisors (see below), whose sum is σ = 93117888. Its totient is φ = 42678944.

The previous prime is 66928409. The next prime is 66928417. The reversal of 66928413 is 31482966.

It is an interprime number because it is at equal distance from previous prime (66928409) and next prime (66928417).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66928413 - 2² = 66928409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66928417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484920 + ... + 485057.

It is an arithmetic number, because the mean of its divisors is an integer number (11639736).

Almost surely, 2^66928413 is an apocalyptic number.

It is an amenable number.

66928413 is a deficient number, since it is larger than the sum of its proper divisors (26189475).

66928413 is a wasteful number, since it uses less digits than its factorization.

66928413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970003.

The product of its digits is 62208, while the sum is 39.

The square root of 66928413 is about 8180.9787311788. The cubic root of 66928413 is about 406.0101047418.

The spelling of 66928413 in words is "sixty-six million, nine hundred twenty-eight thousand, four hundred thirteen".