408272640 has 72 divisors (see below), whose sum is σ = 1303933008. Its totient is φ = 108871680.

The previous prime is 408272639. The next prime is 408272647. The reversal of 408272640 is 46272804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408272647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49321 + ... + 57000.

Almost surely, 2^408272640 is an apocalyptic number.

408272640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

408272640 is an abundant number, since it is smaller than the sum of its proper divisors (895660368).

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

408272640 is a wasteful number, since it uses less digits than its factorization.

408272640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106345 (or 106331 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 408272640 is about 20205.7575952994. The cubic root of 408272640 is about 741.8511239784.

The spelling of 408272640 in words is "four hundred eight million, two hundred seventy-two thousand, six hundred forty".