87278018204821 has 16 divisors (see below), whose sum is σ = 94476822312960. Its totient is φ = 80432970226560.

The previous prime is 87278018204809. The next prime is 87278018204863. The reversal of 87278018204821 is 12840281087278.

It is a cyclic number.

It is not a de Polignac number, because 87278018204821 - 2⁷ = 87278018204693 is a prime.

It is a super-2 number, since 2×87278018204821² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87278018304821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664889485 + ... + 665020738.

It is an arithmetic number, because the mean of its divisors is an integer number (5904801394560).

Almost surely, 2^{87278018204821} is an apocalyptic number.

It is an amenable number.

87278018204821 is a deficient number, since it is larger than the sum of its proper divisors (7198804108139).

87278018204821 is a wasteful number, since it uses less digits than its factorization.

87278018204821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329910356.

The product of its (nonzero) digits is 6422528, while the sum is 58.

The spelling of 87278018204821 in words is "eighty-seven trillion, two hundred seventy-eight billion, eighteen million, two hundred four thousand, eight hundred twenty-one".