40628809 has 4 divisors (see below), whose sum is σ = 43754116. Its totient is φ = 37503504.

The previous prime is 40628771. The next prime is 40628813. The reversal of 40628809 is 90882604.

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 9859600 + 30769209 = 3140^2 + 5547^2 .

It is a cyclic number.

It is not a de Polignac number, because 40628809 - 2⁹ = 40628297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40628839) 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, 1562634 + ... + 1562659.

It is an arithmetic number, because the mean of its divisors is an integer number (10938529).

Almost surely, 2^40628809 is an apocalyptic number.

It is an amenable number.

40628809 is a deficient number, since it is larger than the sum of its proper divisors (3125307).

40628809 is a wasteful number, since it uses less digits than its factorization.

40628809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125306.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 40628809 is about 6374.0731875309. The cubic root of 40628809 is about 343.7779603042. Note that the first 3 decimals are identical.

It can be divided in two parts, 40 and 628809, that added together give a square (628849 = 793²).

The spelling of 40628809 in words is "forty million, six hundred twenty-eight thousand, eight hundred nine".