67720536 has 80 divisors (see below), whose sum is σ = 204296400. Its totient is φ = 20834496.

The previous prime is 67720531. The next prime is 67720547. The reversal of 67720536 is 63502776.

It is a happy number.

It is a super-2 number, since 2×67720536² = 9172141992254592, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 67720536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67720531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4405 + ... + 12443.

It is an arithmetic number, because the mean of its divisors is an integer number (2553705).

Almost surely, 2^67720536 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 67720536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102148200).

67720536 is an abundant number, since it is smaller than the sum of its proper divisors (136575864).

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

67720536 is a wasteful number, since it uses less digits than its factorization.

67720536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070 (or 8057 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 67720536 is about 8229.2488114044. The cubic root of 67720536 is about 407.6055877039.

The spelling of 67720536 in words is "sixty-seven million, seven hundred twenty thousand, five hundred thirty-six".