87640820742 has 8 divisors (see below), whose sum is σ = 175281641496. Its totient is φ = 29213606912.

The previous prime is 87640820689. The next prime is 87640820753. The reversal of 87640820742 is 24702804678.

It is a happy number.

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

87640820742 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 87640820691 and 87640820700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7303401723 + ... + 7303401734.

It is an arithmetic number, because the mean of its divisors is an integer number (21910205187).

Almost surely, 2^87640820742 is an apocalyptic number.

87640820742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

87640820742 is a wasteful number, since it uses less digits than its factorization.

87640820742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14606803462.

The product of its (nonzero) digits is 1204224, while the sum is 48.

The spelling of 87640820742 in words is "eighty-seven billion, six hundred forty million, eight hundred twenty thousand, seven hundred forty-two".