67021992 has 80 divisors (see below), whose sum is σ = 188897940. Its totient is φ = 22201344.

The previous prime is 67021979. The next prime is 67022017. The reversal of 67021992 is 29912076.

It can be written as a sum of positive squares in 2 ways, for example, as 63584676 + 3437316 = 7974^2 + 1854^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 189688 + ... + 190040.

Almost surely, 2^67021992 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 67021992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94448970).

67021992 is an abundant number, since it is smaller than the sum of its proper divisors (121875948).

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

67021992 is a wasteful number, since it uses less digits than its factorization.

67021992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 67021992 is about 8186.6960368637. The cubic root of 67021992 is about 406.1992437733.

The spelling of 67021992 in words is "sixty-seven million, twenty-one thousand, nine hundred ninety-two".