40689564 has 48 divisors (see below), whose sum is σ = 100598400. Its totient is φ = 12764736.

The previous prime is 40689559. The next prime is 40689617. The reversal of 40689564 is 46598604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40314 + ... + 41310.

It is an arithmetic number, because the mean of its divisors is an integer number (2095800).

Almost surely, 2^40689564 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 40689564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50299200).

40689564 is an abundant number, since it is smaller than the sum of its proper divisors (59908836).

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

40689564 is a wasteful number, since it uses less digits than its factorization.

40689564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1200 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 40689564 is about 6378.8371981106. The cubic root of 40689564 is about 343.9492330888.

The spelling of 40689564 in words is "forty million, six hundred eighty-nine thousand, five hundred sixty-four".