40646720 has 56 divisors (see below), whose sum is σ = 99434904. Its totient is φ = 15814656.

The previous prime is 40646713. The next prime is 40646729. The reversal of 40646720 is 2764604.

It can be written as a sum of positive squares in 4 ways, for example, as 8111104 + 32535616 = 2848^2 + 5704^2 .

It is not an unprimeable number, because it can be changed into a prime (40646729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10124 + ... + 13556.

Almost surely, 2^40646720 is an apocalyptic number.

40646720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40646720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49717452).

40646720 is an abundant number, since it is smaller than the sum of its proper divisors (58788184).

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

40646720 is a wasteful number, since it uses less digits than its factorization.

40646720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487 (or 3477 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 40646720 is about 6375.4780212938. The cubic root of 40646720 is about 343.8284704602.

The spelling of 40646720 in words is "forty million, six hundred forty-six thousand, seven hundred twenty".