87438467455540 has 24 divisors (see below), whose sum is σ = 184200027037992. Its totient is φ = 34865054528640.

The previous prime is 87438467455523. The next prime is 87438467455543. The reversal of 87438467455540 is 4555476483478.

It can be written as a sum of positive squares in 4 ways, for example, as 3053924012304 + 84384543443236 = 1747548^2 + 9186106^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87438467455540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87438467455543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6895771851 + ... + 6895784530.

It is an arithmetic number, because the mean of its divisors is an integer number (7675001126583).

Almost surely, 2^{87438467455540} is an apocalyptic number.

It is an amenable number.

87438467455540 is an abundant number, since it is smaller than the sum of its proper divisors (96761559582452).

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

87438467455540 is a wasteful number, since it uses less digits than its factorization.

87438467455540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13791556707 (or 13791556705 counting only the distinct ones).

The product of its (nonzero) digits is 1806336000, while the sum is 70.

The spelling of 87438467455540 in words is "eighty-seven trillion, four hundred thirty-eight billion, four hundred sixty-seven million, four hundred fifty-five thousand, five hundred forty".