87138883784 has 16 divisors (see below), whose sum is σ = 169019387100. Its totient is φ = 42067047232.

The previous prime is 87138883771. The next prime is 87138883837. The reversal of 87138883784 is 48738883178.

It can be written as a sum of positive squares in 2 ways, for example, as 87137136100 + 1747684 = 295190^2 + 1322^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87138883784.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187799087 + ... + 187799550.

Almost surely, 2^87138883784 is an apocalyptic number.

It is an amenable number.

87138883784 is a deficient number, since it is larger than the sum of its proper divisors (81880503316).

87138883784 is a wasteful number, since it uses less digits than its factorization.

87138883784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375598672 (or 375598668 counting only the distinct ones).

The product of its digits is 57802752, while the sum is 65.

The spelling of 87138883784 in words is "eighty-seven billion, one hundred thirty-eight million, eight hundred eighty-three thousand, seven hundred eighty-four".