27988955401 has 27 divisors (see below), whose sum is σ = 31368934317. Its totient is φ = 24954318840.

The previous prime is 27988955389. The next prime is 27988955411. The reversal of 27988955401 is 10455988972.

The square root of 27988955401 is 167299.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 27988955401 - 2¹⁹ = 27988431113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27988955411) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 123299250 + ... + 123299476.

Almost surely, 2^27988955401 is an apocalyptic number.

27988955401 is the 167299-th square number.

27988955401 is the 83650-th centered octagonal number.

It is an amenable number.

27988955401 is a deficient number, since it is larger than the sum of its proper divisors (3379978916).

27988955401 is an frugal number, since it uses more digits than its factorization.

27988955401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 58.

It can be divided in two parts, 27988 and 955401, that added together give a palindrome (983389).

The spelling of 27988955401 in words is "twenty-seven billion, nine hundred eighty-eight million, nine hundred fifty-five thousand, four hundred one".