667371428 has 24 divisors (see below), whose sum is σ = 1236261600. Its totient is φ = 314350848.

The previous prime is 667371421. The next prime is 667371451. The reversal of 667371428 is 824173766.

It is not an unprimeable number, because it can be changed into a prime (667371421) 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, 10925 + ... + 38132.

It is an arithmetic number, because the mean of its divisors is an integer number (51510900).

Almost surely, 2^667371428 is an apocalyptic number.

It is an amenable number.

667371428 is a deficient number, since it is larger than the sum of its proper divisors (568890172).

667371428 is a wasteful number, since it uses less digits than its factorization.

667371428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49259 (or 49257 counting only the distinct ones).

The product of its digits is 338688, while the sum is 44.

The square root of 667371428 is about 25833.5330142820. The cubic root of 667371428 is about 873.8881891922. Note that the first 3 decimals are identical.

The spelling of 667371428 in words is "six hundred sixty-seven million, three hundred seventy-one thousand, four hundred twenty-eight".