40647744 has 70 divisors (see below), whose sum is σ = 120508014. Its totient is φ = 13547520.

The previous prime is 40647743. The next prime is 40647749. The reversal of 40647744 is 44774604.

40647744 is a `hidden beast` number, since 4 + 0 + 647 + 7 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 32353344 + 8294400 = 5688^2 + 2880^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 40647699 and 40647708.

It is not an unprimeable number, because it can be changed into a prime (40647743) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1264 + ... + 9104.

Almost surely, 2^40647744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40647744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60254007).

40647744 is an abundant number, since it is smaller than the sum of its proper divisors (79860270).

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

40647744 is an equidigital number, since it uses as much as digits as its factorization.

40647744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7865 (or 7846 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The square root of 40647744 is about 6375.5583284917. The cubic root of 40647744 is about 343.8313577567.

The spelling of 40647744 in words is "forty million, six hundred forty-seven thousand, seven hundred forty-four".