31878421487 has 8 divisors (see below), whose sum is σ = 35898281472. Its totient is φ = 28045531800.

The previous prime is 31878421469. The next prime is 31878421507. The reversal of 31878421487 is 78412487813.

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

It is not a de Polignac number, because 31878421487 - 2⁶ = 31878421423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31878421457) 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, 46742213 + ... + 46742894.

It is an arithmetic number, because the mean of its divisors is an integer number (4487285184).

Almost surely, 2^31878421487 is an apocalyptic number.

31878421487 is a deficient number, since it is larger than the sum of its proper divisors (4019859985).

31878421487 is a wasteful number, since it uses less digits than its factorization.

31878421487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93485149.

The product of its digits is 2408448, while the sum is 53.

The spelling of 31878421487 in words is "thirty-one billion, eight hundred seventy-eight million, four hundred twenty-one thousand, four hundred eighty-seven".