820646497 has 8 divisors (see below), whose sum is σ = 895669632. Its totient is φ = 745693200.

The previous prime is 820646479. The next prime is 820646507. The reversal of 820646497 is 794646028.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 820646497 - 2¹¹ = 820644449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820646297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8847 + ... + 41467.

It is an arithmetic number, because the mean of its divisors is an integer number (111958704).

Almost surely, 2^820646497 is an apocalyptic number.

It is an amenable number.

820646497 is a deficient number, since it is larger than the sum of its proper divisors (75023135).

820646497 is a wasteful number, since it uses less digits than its factorization.

820646497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34919.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 820646497 is about 28646.9282297422. The cubic root of 820646497 is about 936.2360793366.

The spelling of 820646497 in words is "eight hundred twenty million, six hundred forty-six thousand, four hundred ninety-seven".