6640154 has 8 divisors (see below), whose sum is σ = 9978228. Its totient is φ = 3314080.

The previous prime is 6640129. The next prime is 6640157. The reversal of 6640154 is 4510466.

It is a happy number.

6640154 is nontrivially palindromic in base 12.

It can be written as a sum of positive squares in 2 ways, for example, as 5650129 + 990025 = 2377^2 + 995^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6640157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1457 + ... + 3924.

Almost surely, 2^6640154 is an apocalyptic number.

6640154 is a deficient number, since it is larger than the sum of its proper divisors (3338074).

6640154 is a wasteful number, since it uses less digits than its factorization.

6640154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 6640154 is about 2576.8496269670. The cubic root of 6640154 is about 187.9573805608.

The spelling of 6640154 in words is "six million, six hundred forty thousand, one hundred fifty-four".