40644651 has 8 divisors (see below), whose sum is σ = 54370624. Its totient is φ = 27007560.

The previous prime is 40644623. The next prime is 40644661. The reversal of 40644651 is 15644604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40644651 - 2⁵ = 40644619 is a prime.

It is a super-3 number, since 3×40644651³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40644601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21145 + ... + 22986.

It is an arithmetic number, because the mean of its divisors is an integer number (6796328).

Almost surely, 2^40644651 is an apocalyptic number.

40644651 is a deficient number, since it is larger than the sum of its proper divisors (13725973).

40644651 is a wasteful number, since it uses less digits than its factorization.

40644651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44441.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 40644651 is about 6375.3157568861. The cubic root of 40644651 is about 343.8226365071.

The spelling of 40644651 in words is "forty million, six hundred forty-four thousand, six hundred fifty-one".