27553734978 has 144 divisors (see below), whose sum is σ = 70675782912. Its totient is φ = 7135128000.

The previous prime is 27553734947. The next prime is 27553734983. The reversal of 27553734978 is 87943735572.

It is a super-2 number, since 2×27553734978² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14121903 + ... + 14123853.

It is an arithmetic number, because the mean of its divisors is an integer number (490804048).

Almost surely, 2^27553734978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27553734978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35337891456).

27553734978 is an abundant number, since it is smaller than the sum of its proper divisors (43122047934).

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

27553734978 is a wasteful number, since it uses less digits than its factorization.

27553734978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389 (or 2371 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 60.

The spelling of 27553734978 in words is "twenty-seven billion, five hundred fifty-three million, seven hundred thirty-four thousand, nine hundred seventy-eight".