87461000647 has 4 divisors (see below), whose sum is σ = 87469330480. Its totient is φ = 87452670816.

The previous prime is 87461000629. The next prime is 87461000651. The reversal of 87461000647 is 74600016478.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87461000647 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 (87461000657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4149147 + ... + 4170172.

It is an arithmetic number, because the mean of its divisors is an integer number (21867332620).

Almost surely, 2^87461000647 is an apocalyptic number.

87461000647 is a deficient number, since it is larger than the sum of its proper divisors (8329833).

87461000647 is a wasteful number, since it uses less digits than its factorization.

87461000647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8329832.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 87461000647 in words is "eighty-seven billion, four hundred sixty-one million, six hundred forty-seven", and thus it is an aban number.