4431621646 has 32 divisors (see below), whose sum is σ = 7139778048. Its totient is φ = 2057600160.

The previous prime is 4431621641. The next prime is 4431621671. The reversal of 4431621646 is 6461261344.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4431621641) 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, 833031 + ... + 838333.

It is an arithmetic number, because the mean of its divisors is an integer number (223118064).

Almost surely, 2^4431621646 is an apocalyptic number.

4431621646 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

4431621646 is a deficient number, since it is larger than the sum of its proper divisors (2708156402).

4431621646 is a wasteful number, since it uses less digits than its factorization.

4431621646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856.

The product of its digits is 82944, while the sum is 37.

The square root of 4431621646 is about 66570.4262116445. The cubic root of 4431621646 is about 1642.5586727842.

The spelling of 4431621646 in words is "four billion, four hundred thirty-one million, six hundred twenty-one thousand, six hundred forty-six".