67639904 has 12 divisors (see below), whose sum is σ = 133166124. Its totient is φ = 33819936.

The previous prime is 67639883. The next prime is 67639907. The reversal of 67639904 is 40993676.

It is a super-2 number, since 2×67639904² = 9150313226258432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67639907) by changing a digit.

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 as a sum of consecutive naturals, namely, 1056842 + ... + 1056905.

It is an arithmetic number, because the mean of its divisors is an integer number (11097177).

Almost surely, 2^67639904 is an apocalyptic number.

It is an amenable number.

67639904 is a deficient number, since it is larger than the sum of its proper divisors (65526220).

67639904 is a wasteful number, since it uses less digits than its factorization.

67639904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113757 (or 2113749 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 67639904 is about 8224.3482416542. The cubic root of 67639904 is about 407.4437505006.

The spelling of 67639904 in words is "sixty-seven million, six hundred thirty-nine thousand, nine hundred four".