27990157440 has 256 divisors, whose sum is σ = 103638723840. Its totient is φ = 6292684800.

The previous prime is 27990157409. The next prime is 27990157451. The reversal of 27990157440 is 4475109972.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 27990157440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 802770 + ... + 836910.

It is an arithmetic number, because the mean of its divisors is an integer number (404838765).

Almost surely, 2^27990157440 is an apocalyptic number.

27990157440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27990157440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51819361920).

27990157440 is an abundant number, since it is smaller than the sum of its proper divisors (75648566400).

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

27990157440 is a wasteful number, since it uses less digits than its factorization.

27990157440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34231 (or 34219 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 27990157440 in words is "twenty-seven billion, nine hundred ninety million, one hundred fifty-seven thousand, four hundred forty".