87388979781 has 8 divisors (see below), whose sum is σ = 117436109824. Its totient is φ = 57800584800.

The previous prime is 87388979779. The next prime is 87388979801. The reversal of 87388979781 is 18797988378.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87388979781 - 2¹ = 87388979779 is a prime.

It is a super-2 number, since 2×87388979781² (a number of 23 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 (87388979701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114683320 + ... + 114684081.

It is an arithmetic number, because the mean of its divisors is an integer number (14679513728).

Almost surely, 2^87388979781 is an apocalyptic number.

It is an amenable number.

87388979781 is a deficient number, since it is larger than the sum of its proper divisors (30047130043).

87388979781 is a wasteful number, since it uses less digits than its factorization.

87388979781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229367531.

The product of its digits is 341397504, while the sum is 75.

The spelling of 87388979781 in words is "eighty-seven billion, three hundred eighty-eight million, nine hundred seventy-nine thousand, seven hundred eighty-one".