26998699640 has 64 divisors (see below), whose sum is σ = 66313728000. Its totient is φ = 9811162240.

The previous prime is 26998699633. The next prime is 26998699687. The reversal of 26998699640 is 4699689962.

It is a super-2 number, since 2×26998699640² (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 15 ways as a sum of consecutive naturals, for example, 666281 + ... + 705639.

It is an arithmetic number, because the mean of its divisors is an integer number (1036152000).

Almost surely, 2^26998699640 is an apocalyptic number.

26998699640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26998699640 is an abundant number, since it is smaller than the sum of its proper divisors (39315028360).

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

26998699640 is a wasteful number, since it uses less digits than its factorization.

26998699640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40940 (or 40936 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 68.

The spelling of 26998699640 in words is "twenty-six billion, nine hundred ninety-eight million, six hundred ninety-nine thousand, six hundred forty".