87978938523 has 16 divisors (see below), whose sum is σ = 136915553280. Its totient is φ = 49204025856.

The previous prime is 87978938477. The next prime is 87978938533. The reversal of 87978938523 is 32583987978.

It is not a de Polignac number, because 87978938523 - 2⁶ = 87978938459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87978938533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44567878 + ... + 44569851.

It is an arithmetic number, because the mean of its divisors is an integer number (8557222080).

Almost surely, 2^87978938523 is an apocalyptic number.

87978938523 is a deficient number, since it is larger than the sum of its proper divisors (48936614757).

87978938523 is a wasteful number, since it uses less digits than its factorization.

87978938523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89137786.

The product of its digits is 182891520, while the sum is 69.

The spelling of 87978938523 in words is "eighty-seven billion, nine hundred seventy-eight million, nine hundred thirty-eight thousand, five hundred twenty-three".