1721375064 has 72 divisors (see below), whose sum is σ = 4839869580. Its totient is φ = 573181920.

The previous prime is 1721375057. The next prime is 1721375081. The reversal of 1721375064 is 4605731271.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1721375064 is a `hidden beast` number, since 17 + 2 + 137 + 506 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1721375064² = 5926264221922008192, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1828834 + ... + 1829774.

Almost surely, 2^1721375064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721375064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419934790).

1721375064 is an abundant number, since it is smaller than the sum of its proper divisors (3118494516).

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

1721375064 is an frugal number, since it uses more digits than its factorization.

1721375064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 1721375064 is about 41489.4572632615. The cubic root of 1721375064 is about 1198.4644860020.

The spelling of 1721375064 in words is "one billion, seven hundred twenty-one million, three hundred seventy-five thousand, sixty-four".