40640650 has 24 divisors (see below), whose sum is σ = 76295340. Its totient is φ = 16104960.

The previous prime is 40640647. The next prime is 40640653. The reversal of 40640650 is 5604604.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40640647) and next prime (40640653).

It can be written as a sum of positive squares in 6 ways, for example, as 14600041 + 26040609 = 3821^2 + 5103^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (40640653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1722 + ... + 9178.

Almost surely, 2^40640650 is an apocalyptic number.

40640650 is a deficient number, since it is larger than the sum of its proper divisors (35654690).

40640650 is a wasteful number, since it uses less digits than its factorization.

40640650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7578 (or 7573 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 40640650 is about 6375.0019607840. The cubic root of 40640650 is about 343.8113543378.

Subtracting from 40640650 its sum of digits (25), we obtain a square (40640625 = 6375²).

The spelling of 40640650 in words is "forty million, six hundred forty thousand, six hundred fifty".