820649463 has 16 divisors (see below), whose sum is σ = 1153363200. Its totient is φ = 517596480.

The previous prime is 820649461. The next prime is 820649471. The reversal of 820649463 is 364946028.

It is a happy number.

It is not a de Polignac number, because 820649463 - 2¹ = 820649461 is a prime.

It is a super-2 number, since 2×820649463² = 1346931082244376738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820649461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33918 + ... + 52836.

It is an arithmetic number, because the mean of its divisors is an integer number (72085200).

Almost surely, 2^820649463 is an apocalyptic number.

820649463 is a deficient number, since it is larger than the sum of its proper divisors (332713737).

820649463 is a wasteful number, since it uses less digits than its factorization.

820649463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19702.

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 820649463 is about 28646.9799978986. The cubic root of 820649463 is about 936.2372072574.

The spelling of 820649463 in words is "eight hundred twenty million, six hundred forty-nine thousand, four hundred sixty-three".