67625781 has 8 divisors (see below), whose sum is σ = 91097664. Its totient is φ = 44618880.

The previous prime is 67625777. The next prime is 67625837. The reversal of 67625781 is 18752676.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67625781 - 2² = 67625777 is a prime.

It is a super-2 number, since 2×67625781² = 9146492511719922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67625771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115905 + ... + 116486.

It is an arithmetic number, because the mean of its divisors is an integer number (11387208).

Almost surely, 2^67625781 is an apocalyptic number.

It is an amenable number.

67625781 is a deficient number, since it is larger than the sum of its proper divisors (23471883).

67625781 is a wasteful number, since it uses less digits than its factorization.

67625781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232491.

The product of its digits is 141120, while the sum is 42.

The square root of 67625781 is about 8223.4895877602. The cubic root of 67625781 is about 407.4153908672.

The spelling of 67625781 in words is "sixty-seven million, six hundred twenty-five thousand, seven hundred eighty-one".