27721203540 has 48 divisors (see below), whose sum is σ = 77638212288. Its totient is φ = 7390526464.

The previous prime is 27721203539. The next prime is 27721203551. The reversal of 27721203540 is 4530212772.

It is a super-2 number, since 2×27721203540² (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, 203044 + ... + 310916.

It is an arithmetic number, because the mean of its divisors is an integer number (1617462756).

Almost surely, 2^27721203540 is an apocalyptic number.

27721203540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27721203540 is an abundant number, since it is smaller than the sum of its proper divisors (49917008748).

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

27721203540 is a wasteful number, since it uses less digits than its factorization.

27721203540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112168 (or 112166 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The spelling of 27721203540 in words is "twenty-seven billion, seven hundred twenty-one million, two hundred three thousand, five hundred forty".