67428691 has 8 divisors (see below), whose sum is σ = 75124224. Its totient is φ = 59994120.

The previous prime is 67428661. The next prime is 67428707. The reversal of 67428691 is 19682476.

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 67428691 - 2¹³ = 67420499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67428611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64695 + ... + 65728.

It is an arithmetic number, because the mean of its divisors is an integer number (9390528).

Almost surely, 2^67428691 is an apocalyptic number.

67428691 is a deficient number, since it is larger than the sum of its proper divisors (7695533).

67428691 is a wasteful number, since it uses less digits than its factorization.

67428691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130481.

The product of its digits is 145152, while the sum is 43.

The square root of 67428691 is about 8211.4974882782. The cubic root of 67428691 is about 407.0192124096.

The spelling of 67428691 in words is "sixty-seven million, four hundred twenty-eight thousand, six hundred ninety-one".