4428213661 has 4 divisors (see below), whose sum is σ = 4431145824. Its totient is φ = 4425281500.

The previous prime is 4428213611. The next prime is 4428213683. The reversal of 4428213661 is 1663128244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4428213661 - 2¹³ = 4428205469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4428213661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4428213611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1463815 + ... + 1466836.

It is an arithmetic number, because the mean of its divisors is an integer number (1107786456).

Almost surely, 2^4428213661 is an apocalyptic number.

It is an amenable number.

4428213661 is a deficient number, since it is larger than the sum of its proper divisors (2932163).

4428213661 is a wasteful number, since it uses less digits than its factorization.

4428213661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932162.

The product of its digits is 55296, while the sum is 37.

The square root of 4428213661 is about 66544.8244493890. The cubic root of 4428213661 is about 1642.1375138711.

It can be divided in two parts, 4428 and 213661, that added together give a square (218089 = 467²).

The spelling of 4428213661 in words is "four billion, four hundred twenty-eight million, two hundred thirteen thousand, six hundred sixty-one".