3728520 has 48 divisors (see below), whose sum is σ = 12118860. Its totient is φ = 994176.

The previous prime is 3728513. The next prime is 3728533. The reversal of 3728520 is 258273.

It can be written as a sum of positive squares in 2 ways, for example, as 3709476 + 19044 = 1926^2 + 138^2 .

It is a super-2 number, since 2×3728520² = 27803722780800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4819 + ... + 5538.

Almost surely, 2^3728520 is an apocalyptic number.

3728520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3728520 is an abundant number, since it is smaller than the sum of its proper divisors (8390340).

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

3728520 is a wasteful number, since it uses less digits than its factorization.

3728520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10374 (or 10367 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 3728520 is about 1930.9375960916. The cubic root of 3728520 is about 155.0644199794.

The spelling of 3728520 in words is "three million, seven hundred twenty-eight thousand, five hundred twenty".