40231664820 has 120 divisors (see below), whose sum is σ = 127806201600. Its totient is φ = 10592607168.

The previous prime is 40231664813. The next prime is 40231664827. The reversal of 40231664820 is 2846613204.

40231664820 is a `hidden beast` number, since 4 + 0 + 2 + 3 + 1 + 6 + 648 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (40231664813) and next prime (40231664827).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40231664827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29200 + ... + 285159.

It is an arithmetic number, because the mean of its divisors is an integer number (1065051680).

Almost surely, 2^40231664820 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 40231664820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63903100800).

40231664820 is an abundant number, since it is smaller than the sum of its proper divisors (87574536780).

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

40231664820 is a wasteful number, since it uses less digits than its factorization.

40231664820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314459 (or 314448 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 40231664820 in words is "forty billion, two hundred thirty-one million, six hundred sixty-four thousand, eight hundred twenty".