5640626 has 4 divisors (see below), whose sum is σ = 8460942. Its totient is φ = 2820312.

The previous prime is 5640623. The next prime is 5640629. The reversal of 5640626 is 6260465.

It is a Cunningham number, because it is equal to 2375²+1.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (5640623) and next prime (5640629).

It can be written as a sum of positive squares in only one way, i.e., 5640625 + 1 = 2375^2 + 1^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5640623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410155 + ... + 1410158.

Almost surely, 2^5640626 is an apocalyptic number.

5640626 is a deficient number, since it is larger than the sum of its proper divisors (2820316).

5640626 is a wasteful number, since it uses less digits than its factorization.

5640626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820315.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 5640626 is about 2375.0002105263. Note that the first 3 decimals coincide. The cubic root of 5640626 is about 178.0091944920.

The spelling of 5640626 in words is "five million, six hundred forty thousand, six hundred twenty-six".