2640136 has 8 divisors (see below), whose sum is σ = 4950270. Its totient is φ = 1320064.

The previous prime is 2640067. The next prime is 2640137. The reversal of 2640136 is 6310462.

It can be written as a sum of positive squares in only one way, i.e., 2268036 + 372100 = 1506^2 + 610^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165001 + ... + 165016.

2^2640136 is an apocalyptic number.

It is an amenable number.

2640136 is a deficient number, since it is larger than the sum of its proper divisors (2310134).

2640136 is a wasteful number, since it uses less digits than its factorization.

2640136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330023 (or 330019 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2640136 is about 1624.8495314951. The cubic root of 2640136 is about 138.2108378361.

Adding to 2640136 its reverse (6310462), we get a palindrome (8950598).

The spelling of 2640136 in words is "two million, six hundred forty thousand, one hundred thirty-six".