26998389972 has 18 divisors (see below), whose sum is σ = 68245930298. Its totient is φ = 8999463312.

The previous prime is 26998389961. The next prime is 26998390037. The reversal of 26998389972 is 27998389962.

It can be written as a sum of positive squares in only one way, i.e., 20436417936 + 6561972036 = 142956^2 + 81006^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×26998389972² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26998389972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 374977603 + ... + 374977674.

Almost surely, 2^26998389972 is an apocalyptic number.

It is an amenable number.

26998389972 is an abundant number, since it is smaller than the sum of its proper divisors (41247540326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26998389972 is a wasteful number, since it uses less digits than its factorization.

26998389972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749955287 (or 749955282 counting only the distinct ones).

The product of its digits is 211631616, while the sum is 72.

The spelling of 26998389972 in words is "twenty-six billion, nine hundred ninety-eight million, three hundred eighty-nine thousand, nine hundred seventy-two".