1464721638 has 16 divisors (see below), whose sum is σ = 3000893616. Its totient is φ = 476332160.

The previous prime is 1464721637. The next prime is 1464721651. The reversal of 1464721638 is 8361274641.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1464721638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1464721633) 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 7 ways as a sum of consecutive naturals, for example, 2976831 + ... + 2977322.

It is an arithmetic number, because the mean of its divisors is an integer number (187555851).

Almost surely, 2^1464721638 is an apocalyptic number.

1464721638 is an abundant number, since it is smaller than the sum of its proper divisors (1536171978).

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

1464721638 is a wasteful number, since it uses less digits than its factorization.

1464721638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5954199.

The product of its digits is 193536, while the sum is 42.

The square root of 1464721638 is about 38271.6819332519. The cubic root of 1464721638 is about 1135.6688116371.

The spelling of 1464721638 in words is "one billion, four hundred sixty-four million, seven hundred twenty-one thousand, six hundred thirty-eight".