820265487 has 32 divisors (see below), whose sum is σ = 1202688000. Its totient is φ = 495029760.

The previous prime is 820265483. The next prime is 820265489. The reversal of 820265487 is 784562028.

It is a happy number.

It is not a de Polignac number, because 820265487 - 2² = 820265483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820265483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 272014 + ... + 275012.

It is an arithmetic number, because the mean of its divisors is an integer number (37584000).

Almost surely, 2^820265487 is an apocalyptic number.

820265487 is a deficient number, since it is larger than the sum of its proper divisors (382422513).

820265487 is a wasteful number, since it uses less digits than its factorization.

820265487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 820265487 is about 28640.2773555006. The cubic root of 820265487 is about 936.0911649187.

The spelling of 820265487 in words is "eight hundred twenty million, two hundred sixty-five thousand, four hundred eighty-seven".