40780656 has 120 divisors (see below), whose sum is σ = 136181760. Its totient is φ = 11138688.

The previous prime is 40780613. The next prime is 40780657. The reversal of 40780656 is 65608704.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 40780656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40780657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22305 + ... + 24063.

It is an arithmetic number, because the mean of its divisors is an integer number (1134848).

Almost surely, 2^40780656 is an apocalyptic number.

40780656 is a gapful number since it is divisible by the number (46) 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 40780656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68090880).

40780656 is an abundant number, since it is smaller than the sum of its proper divisors (95401104).

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

40780656 is a wasteful number, since it uses less digits than its factorization.

40780656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803 (or 1794 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 40780656 is about 6385.9733792117. The cubic root of 40780656 is about 344.2057089446.

The spelling of 40780656 in words is "forty million, seven hundred eighty thousand, six hundred fifty-six".