28621788767138 has 16 divisors (see below), whose sum is σ = 49349541660480. Its totient is φ = 12195576385296.

The previous prime is 28621788767101. The next prime is 28621788767161. The reversal of 28621788767138 is 83176788712682.

It is a super-2 number, since 2×28621788767138² (a number of 28 digits) contains 22 as substring.

It is a Curzon 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, 5908707068 + ... + 5908711911.

It is an arithmetic number, because the mean of its divisors is an integer number (3084346353780).

Almost surely, 2^{28621788767138} is an apocalyptic number.

28621788767138 is a deficient number, since it is larger than the sum of its proper divisors (20727752893342).

28621788767138 is a wasteful number, since it uses less digits than its factorization.

28621788767138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11817419161.

The product of its digits is 606928896, while the sum is 74.

The spelling of 28621788767138 in words is "twenty-eight trillion, six hundred twenty-one billion, seven hundred eighty-eight million, seven hundred sixty-seven thousand, one hundred thirty-eight".