15072257 has 4 divisors (see below), whose sum is σ = 15592020. Its totient is φ = 14552496.

The previous prime is 15072247. The next prime is 15072259. The reversal of 15072257 is 75227051.

15072257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6754801 + 8317456 = 2599^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 15072257 - 2¹² = 15068161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 519733 = 15072257 / (1 + 5 + 0 + 7 + 2 + 2 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15072259) 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, 259838 + ... + 259895.

It is an arithmetic number, because the mean of its divisors is an integer number (3898005).

Almost surely, 2^15072257 is an apocalyptic number.

It is an amenable number.

15072257 is a deficient number, since it is larger than the sum of its proper divisors (519763).

15072257 is an equidigital number, since it uses as much as digits as its factorization.

15072257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519762.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 15072257 is about 3882.3004778095. The cubic root of 15072257 is about 247.0165756768.

The spelling of 15072257 in words is "fifteen million, seventy-two thousand, two hundred fifty-seven".