40615640 has 64 divisors (see below), whose sum is σ = 101122560. Its totient is φ = 14584320.

The previous prime is 40615639. The next prime is 40615643. The reversal of 40615640 is 4651604.

It is a happy number.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40615643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18185 + ... + 20295.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^40615640 is an apocalyptic number.

40615640 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 40615640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50561280).

40615640 is an abundant number, since it is smaller than the sum of its proper divisors (60506920).

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

40615640 is a wasteful number, since it uses less digits than its factorization.

40615640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 40615640 is about 6373.0400908828. The cubic root of 40615640 is about 343.7408134184.

The spelling of 40615640 in words is "forty million, six hundred fifteen thousand, six hundred forty".