1722878624 has 36 divisors (see below), whose sum is σ = 3465763434. Its totient is φ = 843076224.

The previous prime is 1722878623. The next prime is 1722878639. The reversal of 1722878624 is 4268782271.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1573550224 + 149328400 = 39668^2 + 12220^2 .

It is a super-2 number, since 2×1722878624² = 5936621506072266752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (1722878623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58502 + ... + 82874.

Almost surely, 2^1722878624 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 1722878624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1732881717).

1722878624 is an abundant number, since it is smaller than the sum of its proper divisors (1742884810).

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

1722878624 is an equidigital number, since it uses as much as digits as its factorization.

1722878624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24477 (or 24422 counting only the distinct ones).

The product of its digits is 602112, while the sum is 47.

The square root of 1722878624 is about 41507.5730921479. The cubic root of 1722878624 is about 1198.8133231816.

The spelling of 1722878624 in words is "one billion, seven hundred twenty-two million, eight hundred seventy-eight thousand, six hundred twenty-four".