820265478 has 8 divisors (see below), whose sum is σ = 1640530968. Its totient is φ = 273421824.

The previous prime is 820265477. The next prime is 820265483. The reversal of 820265478 is 874562028.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

820265478 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820265477) 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, 68355451 + ... + 68355462.

It is an arithmetic number, because the mean of its divisors is an integer number (205066371).

Almost surely, 2^820265478 is an apocalyptic number.

820265478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

820265478 is a wasteful number, since it uses less digits than its factorization.

820265478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136710918.

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

The square root of 820265478 is about 28640.2771983792. The cubic root of 820265478 is about 936.0911614951.

The spelling of 820265478 in words is "eight hundred twenty million, two hundred sixty-five thousand, four hundred seventy-eight".