40624561 has 4 divisors (see below), whose sum is σ = 40640292. Its totient is φ = 40608832.

The previous prime is 40624559. The next prime is 40624589. The reversal of 40624561 is 16542604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31809600 + 8814961 = 5640^2 + 2969^2 .

It is a cyclic number.

It is not a de Polignac number, because 40624561 - 2¹ = 40624559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40624511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2980 + ... + 9493.

It is an arithmetic number, because the mean of its divisors is an integer number (10160073).

Almost surely, 2^40624561 is an apocalyptic number.

It is an amenable number.

40624561 is a deficient number, since it is larger than the sum of its proper divisors (15731).

40624561 is a wasteful number, since it uses less digits than its factorization.

40624561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15730.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 40624561 is about 6373.7399539046. The cubic root of 40624561 is about 343.7659784969.

The spelling of 40624561 in words is "forty million, six hundred twenty-four thousand, five hundred sixty-one".