67931690 has 16 divisors (see below), whose sum is σ = 124585128. Its totient is φ = 26659776.

The previous prime is 67931681. The next prime is 67931713. The reversal of 67931690 is 9613976.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 67848169 + 83521 = 8237^2 + 289^2 .

It is a super-2 number, since 2×67931690² = 9229429012512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63557 + ... + 64616.

Almost surely, 2^67931690 is an apocalyptic number.

67931690 is a deficient number, since it is larger than the sum of its proper divisors (56653438).

67931690 is a wasteful number, since it uses less digits than its factorization.

67931690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128233.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 67931690 is about 8242.0683083799. The cubic root of 67931690 is about 408.0287889784.

The spelling of 67931690 in words is "sixty-seven million, nine hundred thirty-one thousand, six hundred ninety".