67664064 has 56 divisors (see below), whose sum is σ = 192806320. Its totient is φ = 20818944.

The previous prime is 67664033. The next prime is 67664087. The reversal of 67664064 is 46046676.

Added to its reverse (46046676) it gives a triangular number (113710740 = T₁₅₀₈₀).

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 11059 + ... + 16050.

It is an arithmetic number, because the mean of its divisors is an integer number (3442970).

Almost surely, 2^67664064 is an apocalyptic number.

67664064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

67664064 is an abundant number, since it is smaller than the sum of its proper divisors (125142256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67664064 is a wasteful number, since it uses less digits than its factorization.

67664064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27137 (or 27127 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 67664064 is about 8225.8169199174. The cubic root of 67664064 is about 407.4922557400.

Adding to 67664064 its reverse (46046676), we get a triangular number (113710740 = T₁₅₀₈₀).

The spelling of 67664064 in words is "sixty-seven million, six hundred sixty-four thousand, sixty-four".