67899139624 has 8 divisors (see below), whose sum is σ = 127310886810. Its totient is φ = 33949569808.

The previous prime is 67899139591. The next prime is 67899139639. The reversal of 67899139624 is 42693199876.

It can be written as a sum of positive squares in only one way, i.e., 51107644900 + 16791494724 = 226070^2 + 129582^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×67899139624² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4243696219 + ... + 4243696234.

Almost surely, 2^67899139624 is an apocalyptic number.

It is an amenable number.

67899139624 is a deficient number, since it is larger than the sum of its proper divisors (59411747186).

67899139624 is a wasteful number, since it uses less digits than its factorization.

67899139624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8487392459 (or 8487392455 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 64.

The spelling of 67899139624 in words is "sixty-seven billion, eight hundred ninety-nine million, one hundred thirty-nine thousand, six hundred twenty-four".