28737320 has 16 divisors (see below), whose sum is σ = 64659060. Its totient is φ = 11494912.

The previous prime is 28737251. The next prime is 28737323. The reversal of 28737320 is 2373782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26481316 + 2256004 = 5146^2 + 1502^2 .

It is not an unprimeable number, because it can be changed into a prime (28737323) 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, 359177 + ... + 359256.

Almost surely, 2^28737320 is an apocalyptic number.

28737320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28737320 is an abundant number, since it is smaller than the sum of its proper divisors (35921740).

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

28737320 is a wasteful number, since it uses less digits than its factorization.

28737320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718444 (or 718440 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 28737320 is about 5360.7201008820. The cubic root of 28737320 is about 306.3012397951.

The spelling of 28737320 in words is "twenty-eight million, seven hundred thirty-seven thousand, three hundred twenty".