40534864640 has 72 divisors (see below), whose sum is σ = 97153592928. Its totient is φ = 16203939840.

The previous prime is 40534864639. The next prime is 40534864661. The reversal of 40534864640 is 4646843504.

It is a junction number, because it is equal to n+sod(n) for n = 40534864591 and 40534864600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2273360 + ... + 2291120.

Almost surely, 2^40534864640 is an apocalyptic number.

40534864640 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 40534864640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48576796464).

40534864640 is an abundant number, since it is smaller than the sum of its proper divisors (56618728288).

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

40534864640 is a wasteful number, since it uses less digits than its factorization.

40534864640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19565 (or 19551 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 44.

The spelling of 40534864640 in words is "forty billion, five hundred thirty-four million, eight hundred sixty-four thousand, six hundred forty".