67537664 has 18 divisors (see below), whose sum is σ = 134812020. Its totient is φ = 33768704.

The previous prime is 67537661. The next prime is 67537669. The reversal of 67537664 is 46673576.

It is a super-2 number, since 2×67537664² = 9122672117153792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67537661) 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, 131654 + ... + 132165.

Almost surely, 2^67537664 is an apocalyptic number.

67537664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

67537664 is a deficient number, since it is larger than the sum of its proper divisors (67274356).

67537664 is an equidigital number, since it uses as much as digits as its factorization.

67537664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263835 (or 263821 counting only the distinct ones).

The product of its digits is 635040, while the sum is 44.

The square root of 67537664 is about 8218.1302009642. The cubic root of 67537664 is about 407.2383586490.

The spelling of 67537664 in words is "sixty-seven million, five hundred thirty-seven thousand, six hundred sixty-four".