8720745 has 32 divisors (see below), whose sum is σ = 16122240. Its totient is φ = 3978240.

The previous prime is 8720729. The next prime is 8720771. The reversal of 8720745 is 5470278.

It is not a de Polignac number, because 8720745 - 2⁴ = 8720729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1251 + ... + 4359.

It is an arithmetic number, because the mean of its divisors is an integer number (503820).

Almost surely, 2^8720745 is an apocalyptic number.

8720745 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8720745 is a deficient number, since it is larger than the sum of its proper divisors (7401495).

8720745 is a wasteful number, since it uses less digits than its factorization.

8720745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 8720745 is about 2953.0907537697. The cubic root of 8720745 is about 205.8343548533.

The spelling of 8720745 in words is "eight million, seven hundred twenty thousand, seven hundred forty-five".