67239456728 has 32 divisors (see below), whose sum is σ = 129024426960. Its totient is φ = 32833167360.

The previous prime is 67239456701. The next prime is 67239456773. The reversal of 67239456728 is 82765493276.

It is a super-2 number, since 2×67239456728² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 4506176 + ... + 4521072.

Almost surely, 2^67239456728 is an apocalyptic number.

It is an amenable number.

67239456728 is a deficient number, since it is larger than the sum of its proper divisors (61784970232).

67239456728 is a wasteful number, since it uses less digits than its factorization.

67239456728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28067 (or 28063 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 59.

The spelling of 67239456728 in words is "sixty-seven billion, two hundred thirty-nine million, four hundred fifty-six thousand, seven hundred twenty-eight".