67390864 has 10 divisors (see below), whose sum is σ = 130569830. Its totient is φ = 33695424.

The previous prime is 67390861. The next prime is 67390919. The reversal of 67390864 is 46809376.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 67371264 + 19600 = 8208^2 + 140^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 67390864.

It is not an unprimeable number, because it can be changed into a prime (67390861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2105949 + ... + 2105980.

It is an arithmetic number, because the mean of its divisors is an integer number (13056983).

Almost surely, 2^67390864 is an apocalyptic number.

It is an amenable number.

67390864 is a deficient number, since it is larger than the sum of its proper divisors (63178966).

67390864 is a wasteful number, since it uses less digits than its factorization.

67390864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211937 (or 4211931 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 67390864 is about 8209.1938702896. The cubic root of 67390864 is about 406.9430865770.

The spelling of 67390864 in words is "sixty-seven million, three hundred ninety thousand, eight hundred sixty-four".