8721475 has 48 divisors (see below), whose sum is σ = 13530880. Its totient is φ = 5443200.

The previous prime is 8721473. The next prime is 8721481. The reversal of 8721475 is 5741278.

8721475 = T₇₄ + T₇₅ + ... + T₃₇₄.

It is a happy number.

It is not a de Polignac number, because 8721475 - 2¹ = 8721473 is a prime.

Its product of digits (15680) is a multiple of the sum of its prime factors (140).

It is a self number, because there is not a number n which added to its sum of digits gives 8721475.

It is not an unprimeable number, because it can be changed into a prime (8721473) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142945 + ... + 143005.

Almost surely, 2^8721475 is an apocalyptic number.

8721475 is a deficient number, since it is larger than the sum of its proper divisors (4809405).

8721475 is a wasteful number, since it uses less digits than its factorization.

8721475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 135 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 8721475 is about 2953.2143505001. The cubic root of 8721475 is about 205.8400980510.

The spelling of 8721475 in words is "eight million, seven hundred twenty-one thousand, four hundred seventy-five".