40642660 has 12 divisors (see below), whose sum is σ = 85349628. Its totient is φ = 16257056.

The previous prime is 40642649. The next prime is 40642663. The reversal of 40642660 is 6624604.

It can be written as a sum of positive squares in 2 ways, for example, as 19501056 + 21141604 = 4416^2 + 4598^2 .

It is not an unprimeable number, because it can be changed into a prime (40642663) 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, 1016047 + ... + 1016086.

It is an arithmetic number, because the mean of its divisors is an integer number (7112469).

Almost surely, 2^40642660 is an apocalyptic number.

It is an amenable number.

40642660 is an abundant number, since it is smaller than the sum of its proper divisors (44706968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40642660 is a wasteful number, since it uses less digits than its factorization.

40642660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032142 (or 2032140 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40642660 is about 6375.1596058452. The cubic root of 40642660 is about 343.8170223034.

It can be divided in two parts, 4064 and 2660, that added together give a square (6724 = 82²).

The spelling of 40642660 in words is "forty million, six hundred forty-two thousand, six hundred sixty".