67723520 has 72 divisors (see below), whose sum is σ = 163736664. Its totient is φ = 26836992.

The previous prime is 67723517. The next prime is 67723531. The reversal of 67723520 is 2532776.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 614656 + 67108864 = 784^2 + 8192^2 .

It is a super-2 number, since 2×67723520² = 9172950322380800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200792 + ... + 201128.

Almost surely, 2^67723520 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 67723520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81868332).

67723520 is an abundant number, since it is smaller than the sum of its proper divisors (96013144).

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

67723520 is a wasteful number, since it uses less digits than its factorization.

67723520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 67723520 is about 8229.4301139265. The cubic root of 67723520 is about 407.6115744512.

The spelling of 67723520 in words is "sixty-seven million, seven hundred twenty-three thousand, five hundred twenty".