6420990463 has 8 divisors (see below), whose sum is σ = 6487909920. Its totient is φ = 6354136800.

The previous prime is 6420990461. The next prime is 6420990481. The reversal of 6420990463 is 3640990246.

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 6420990463 - 2¹ = 6420990461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420990461) 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, 193606 + ... + 224332.

It is an arithmetic number, because the mean of its divisors is an integer number (810988740).

Almost surely, 2^6420990463 is an apocalyptic number.

6420990463 is a deficient number, since it is larger than the sum of its proper divisors (66919457).

6420990463 is a wasteful number, since it uses less digits than its factorization.

6420990463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32897.

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 6420990463 is about 80131.0830015419. The cubic root of 6420990463 is about 1858.6630913128.

The spelling of 6420990463 in words is "six billion, four hundred twenty million, nine hundred ninety thousand, four hundred sixty-three".