40642664 has 8 divisors (see below), whose sum is σ = 76205010. Its totient is φ = 20321328.

The previous prime is 40642663. The next prime is 40642711. The reversal of 40642664 is 46624604.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 16337764 = 4930^2 + 4042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×40642664² = 3303652274033792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40642664.

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 as a sum of consecutive naturals, namely, 2540159 + ... + 2540174.

Almost surely, 2^40642664 is an apocalyptic number.

It is an amenable number.

40642664 is a deficient number, since it is larger than the sum of its proper divisors (35562346).

40642664 is a wasteful number, since it uses less digits than its factorization.

40642664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080339 (or 5080335 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 40642664 is about 6375.1599195628. The cubic root of 40642664 is about 343.8170335828.

The spelling of 40642664 in words is "forty million, six hundred forty-two thousand, six hundred sixty-four".