1723696128 has 396 divisors, whose sum is σ = 6334269552. Its totient is φ = 446423040.

The previous prime is 1723696043. The next prime is 1723696141. The reversal of 1723696128 is 8216963271.

1723696128 is a `hidden beast` number, since 1 + 7 + 23 + 6 + 9 + 612 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (396).

It is a super-2 number, since 2×1723696128² = 5942256683364384768, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4967251 + ... + 4967597.

Almost surely, 2^1723696128 is an apocalyptic number.

1723696128 is a gapful number since it is divisible by the number (18) 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 1723696128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3167134776).

1723696128 is an abundant number, since it is smaller than the sum of its proper divisors (4610573424).

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

1723696128 is a wasteful number, since it uses less digits than its factorization.

1723696128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 370 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1723696128 is about 41517.4195729937. The cubic root of 1723696128 is about 1199.0029050642.

The spelling of 1723696128 in words is "one billion, seven hundred twenty-three million, six hundred ninety-six thousand, one hundred twenty-eight".