27620821542 has 16 divisors (see below), whose sum is σ = 55355081472. Its totient is φ = 9188034120.

The previous prime is 27620821517. The next prime is 27620821573. The reversal of 27620821542 is 24512802672.

It is a super-2 number, since 2×27620821542² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27620821542.

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, 4723434 + ... + 4729277.

It is an arithmetic number, because the mean of its divisors is an integer number (3459692592).

Almost surely, 2^27620821542 is an apocalyptic number.

27620821542 is an abundant number, since it is smaller than the sum of its proper divisors (27734259930).

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

27620821542 is a wasteful number, since it uses less digits than its factorization.

27620821542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9453203.

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 27620821542 in words is "twenty-seven billion, six hundred twenty million, eight hundred twenty-one thousand, five hundred forty-two".