662879021 has 32 divisors (see below), whose sum is σ = 816818688. Its totient is φ = 525634560.

The previous prime is 662878987. The next prime is 662879033. The reversal of 662879021 is 120978266.

It is a cyclic number.

It is not a de Polignac number, because 662879021 - 2¹⁰ = 662877997 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a self number, because there is not a number n which added to its sum of digits gives 662879021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662879051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 903971 + ... + 904703.

It is an arithmetic number, because the mean of its divisors is an integer number (25525584).

Almost surely, 2^662879021 is an apocalyptic number.

It is an amenable number.

662879021 is a deficient number, since it is larger than the sum of its proper divisors (153939667).

662879021 is a wasteful number, since it uses less digits than its factorization.

662879021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 662879021 is about 25746.4370544742. The cubic root of 662879021 is about 871.9229150254.

The spelling of 662879021 in words is "six hundred sixty-two million, eight hundred seventy-nine thousand, twenty-one".