67263781 has 32 divisors (see below), whose sum is σ = 82131840. Its totient is φ = 54411264.

The previous prime is 67263773. The next prime is 67263803. The reversal of 67263781 is 18736276.

It is a 7-Lehmer number, since φ(67263781) divides (67263781-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 67263781 - 2³ = 67263773 is a prime.

It is a super-2 number, since 2×67263781² = 9048832468831922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67263701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 348421 + ... + 348613.

It is an arithmetic number, because the mean of its divisors is an integer number (2566620).

Almost surely, 2^67263781 is an apocalyptic number.

It is an amenable number.

67263781 is a deficient number, since it is larger than the sum of its proper divisors (14868059).

67263781 is a wasteful number, since it uses less digits than its factorization.

67263781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its digits is 84672, while the sum is 40.

The square root of 67263781 is about 8201.4499327863. The cubic root of 67263781 is about 406.6871266095.

The spelling of 67263781 in words is "sixty-seven million, two hundred sixty-three thousand, seven hundred eighty-one".