6420961893 has 16 divisors (see below), whose sum is σ = 8961933312. Its totient is φ = 4084206000.

The previous prime is 6420961879. The next prime is 6420961901. The reversal of 6420961893 is 3981690246.

It is not a de Polignac number, because 6420961893 - 2⁹ = 6420961381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420961853) 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, 479613 + ... + 492818.

It is an arithmetic number, because the mean of its divisors is an integer number (560120832).

Almost surely, 2^6420961893 is an apocalyptic number.

It is an amenable number.

6420961893 is a deficient number, since it is larger than the sum of its proper divisors (2540971419).

6420961893 is a wasteful number, since it uses less digits than its factorization.

6420961893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972536.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 6420961893 is about 80130.9047309463. The cubic root of 6420961893 is about 1858.6603346205.

The spelling of 6420961893 in words is "six billion, four hundred twenty million, nine hundred sixty-one thousand, eight hundred ninety-three".