403728644 has 48 divisors (see below), whose sum is σ = 814329600. Its totient is φ = 173210400.

The previous prime is 403728643. The next prime is 403728659. The reversal of 403728644 is 446827304.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 403728598 and 403728607.

It is not an unprimeable number, because it can be changed into a prime (403728643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275987 + ... + 277445.

It is an arithmetic number, because the mean of its divisors is an integer number (16965200).

Almost surely, 2^403728644 is an apocalyptic number.

403728644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

403728644 is an abundant number, since it is smaller than the sum of its proper divisors (410600956).

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

403728644 is a wasteful number, since it uses less digits than its factorization.

403728644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824 (or 1822 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 38.

The square root of 403728644 is about 20092.9998755786. Note that the first 3 decimals coincide. The cubic root of 403728644 is about 739.0886296775.

The spelling of 403728644 in words is "four hundred three million, seven hundred twenty-eight thousand, six hundred forty-four".