27678614640 has 40 divisors (see below), whose sum is σ = 85803706128. Its totient is φ = 7380963840.

The previous prime is 27678614627. The next prime is 27678614657. The reversal of 27678614640 is 4641687672.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×27678614640² (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 7 ways as a sum of consecutive naturals, for example, 57663541 + ... + 57664020.

Almost surely, 2^27678614640 is an apocalyptic number.

27678614640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27678614640 is an abundant number, since it is smaller than the sum of its proper divisors (58125091488).

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

27678614640 is a wasteful number, since it uses less digits than its factorization.

27678614640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115327577 (or 115327571 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 51.

The spelling of 27678614640 in words is "twenty-seven billion, six hundred seventy-eight million, six hundred fourteen thousand, six hundred forty".