667428215 has 8 divisors (see below), whose sum is σ = 801057408. Its totient is φ = 533846880.

The previous prime is 667428193. The next prime is 667428221. The reversal of 667428215 is 512824766.

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

It is not a de Polignac number, because 667428215 - 2¹⁴ = 667411831 is a prime.

It is a Duffinian number.

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, 36785 + ... + 51845.

It is an arithmetic number, because the mean of its divisors is an integer number (100132176).

Almost surely, 2^667428215 is an apocalyptic number.

667428215 is a deficient number, since it is larger than the sum of its proper divisors (133629193).

667428215 is a wasteful number, since it uses less digits than its factorization.

667428215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23929.

The product of its digits is 161280, while the sum is 41.

The square root of 667428215 is about 25834.6320856326. The cubic root of 667428215 is about 873.9129750306.

The spelling of 667428215 in words is "six hundred sixty-seven million, four hundred twenty-eight thousand, two hundred fifteen".