4021920864 has 120 divisors (see below), whose sum is σ = 12738337920. Its totient is φ = 1237503744.

The previous prime is 4021920863. The next prime is 4021920901. The reversal of 4021920864 is 4680291204.

4021920864 is a `hidden beast` number, since 402 + 192 + 0 + 8 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021920863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25984 + ... + 93375.

It is an arithmetic number, because the mean of its divisors is an integer number (106152816).

Almost surely, 2^4021920864 is an apocalyptic number.

It is an amenable number.

4021920864 is an abundant number, since it is smaller than the sum of its proper divisors (8716417056).

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

4021920864 is a wasteful number, since it uses less digits than its factorization.

4021920864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119394 (or 119377 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 4021920864 is about 63418.6160681546. The cubic root of 4021920864 is about 1590.2955378018.

The spelling of 4021920864 in words is "four billion, twenty-one million, nine hundred twenty thousand, eight hundred sixty-four".