1721725632 has 280 divisors, whose sum is σ = 5639074320. Its totient is φ = 515082240.

The previous prime is 1721725631. The next prime is 1721725637. The reversal of 1721725632 is 2365271271.

1721725632 is a `hidden beast` number, since 1 + 7 + 2 + 17 + 2 + 5 + 632 = 666.

1721725632 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (1721725631) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6215478 + ... + 6215754.

Almost surely, 2^1721725632 is an apocalyptic number.

1721725632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721725632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2819537160).

1721725632 is an abundant number, since it is smaller than the sum of its proper divisors (3917348688).

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

1721725632 is a wasteful number, since it uses less digits than its factorization.

1721725632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 402 counting only the distinct ones).

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

The square root of 1721725632 is about 41493.6818322983. The cubic root of 1721725632 is about 1198.5458385572.

It can be divided in two parts, 17217 and 25632, that added together give a square (42849 = 207²).

The spelling of 1721725632 in words is "one billion, seven hundred twenty-one million, seven hundred twenty-five thousand, six hundred thirty-two".