40640512 has 84 divisors (see below), whose sum is σ = 91515438. Its totient is φ = 18022400.

The previous prime is 40640507. The next prime is 40640519. The reversal of 40640512 is 21504604.

It can be written as a sum of positive squares in only one way, i.e., 40144896 + 495616 = 6336^2 + 704^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (40640519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 991212 + ... + 991252.

Almost surely, 2^40640512 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 40640512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45757719).

40640512 is an abundant number, since it is smaller than the sum of its proper divisors (50874926).

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

40640512 is an equidigital number, since it uses as much as digits as its factorization.

40640512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40640512 is about 6374.9911372487. The cubic root of 40640512 is about 343.8109651870.

The spelling of 40640512 in words is "forty million, six hundred forty thousand, five hundred twelve".