40642164 has 18 divisors (see below), whose sum is σ = 102734450. Its totient is φ = 13547376.

The previous prime is 40642157. The next prime is 40642177. The reversal of 40642164 is 46124604.

40642164 is a `hidden beast` number, since 4 + 0 + 642 + 16 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30338064 + 10304100 = 5508^2 + 3210^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 564439 + ... + 564510.

Almost surely, 2^40642164 is an apocalyptic number.

It is an amenable number.

40642164 is an abundant number, since it is smaller than the sum of its proper divisors (62092286).

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

40642164 is a wasteful number, since it uses less digits than its factorization.

40642164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128959 (or 1128954 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 40642164 is about 6375.1207047396. The cubic root of 40642164 is about 343.8156236586.

Adding to 40642164 its reverse (46124604), we get a palindrome (86766768).

The spelling of 40642164 in words is "forty million, six hundred forty-two thousand, one hundred sixty-four".