40661720 has 32 divisors (see below), whose sum is σ = 99807120. Its totient is φ = 14785920.

The previous prime is 40661713. The next prime is 40661743. The reversal of 40661720 is 2716604.

40661720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 40661720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45767 + ... + 46646.

Almost surely, 2^40661720 is an apocalyptic number.

40661720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40661720 is an abundant number, since it is smaller than the sum of its proper divisors (59145400).

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

40661720 is a wasteful number, since it uses less digits than its factorization.

40661720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92435 (or 92431 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 40661720 is about 6376.6542951614. The cubic root of 40661720 is about 343.8707599961.

Subtracting from 40661720 its reverse (2716604), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 406 and 61720, that added together give a palindrome (62126).

The spelling of 40661720 in words is "forty million, six hundred sixty-one thousand, seven hundred twenty".