67764390 has 64 divisors (see below), whose sum is σ = 171218880. Its totient is φ = 17141760.

The previous prime is 67764379. The next prime is 67764401. The reversal of 67764390 is 9346776.

It is an interprime number because it is at equal distance from previous prime (67764379) and next prime (67764401).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44766 + ... + 46254.

It is an arithmetic number, because the mean of its divisors is an integer number (2675295).

Almost surely, 2^67764390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67764390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85609440).

67764390 is an abundant number, since it is smaller than the sum of its proper divisors (103454490).

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

67764390 is a wasteful number, since it uses less digits than its factorization.

67764390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577.

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 67764390 is about 8231.9129004139. The cubic root of 67764390 is about 407.6935535283.

The spelling of 67764390 in words is "sixty-seven million, seven hundred sixty-four thousand, three hundred ninety".