67690881 has 6 divisors (see below), whose sum is σ = 97775730. Its totient is φ = 45127248.

The previous prime is 67690859. The next prime is 67690919. The reversal of 67690881 is 18809676.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 50126400 + 17564481 = 7080^2 + 4191^2 .

It is not a de Polignac number, because 67690881 - 2¹³ = 67682689 is a prime.

It is a super-2 number, since 2×67690881² = 9164110741112322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67690801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3760596 + ... + 3760613.

It is an arithmetic number, because the mean of its divisors is an integer number (16295955).

Almost surely, 2^67690881 is an apocalyptic number.

It is an amenable number.

67690881 is a deficient number, since it is larger than the sum of its proper divisors (30084849).

67690881 is a wasteful number, since it uses less digits than its factorization.

67690881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7521215 (or 7521212 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 67690881 is about 8227.4468093085. The cubic root of 67690881 is about 407.5460818325.

The spelling of 67690881 in words is "sixty-seven million, six hundred ninety thousand, eight hundred eighty-one".