27278192640 has 208 divisors, whose sum is σ = 88936960608. Its totient is φ = 7136083968.

The previous prime is 27278192597. The next prime is 27278192723. The reversal of 27278192640 is 4629187272.

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 27278192640.

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, 3252132 + ... + 3260508.

Almost surely, 2^27278192640 is an apocalyptic number.

27278192640 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 27278192640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44468480304).

27278192640 is an abundant number, since it is smaller than the sum of its proper divisors (61658767968).

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

27278192640 is an equidigital number, since it uses as much as digits as its factorization.

27278192640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8462 (or 8440 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 27278192640 in words is "twenty-seven billion, two hundred seventy-eight million, one hundred ninety-two thousand, six hundred forty".