87661646 has 4 divisors (see below), whose sum is σ = 131492472. Its totient is φ = 43830822.

The previous prime is 87661643. The next prime is 87661657. The reversal of 87661646 is 64616678.

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

It is a junction number, because it is equal to n+sod(n) for n = 87661597 and 87661606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87661643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21915410 + ... + 21915413.

It is an arithmetic number, because the mean of its divisors is an integer number (32873118).

Almost surely, 2^87661646 is an apocalyptic number.

87661646 is a deficient number, since it is larger than the sum of its proper divisors (43830826).

87661646 is a wasteful number, since it uses less digits than its factorization.

87661646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43830825.

The product of its digits is 290304, while the sum is 44.

The square root of 87661646 is about 9362.7798222536. The cubic root of 87661646 is about 444.2252158014.

The spelling of 87661646 in words is "eighty-seven million, six hundred sixty-one thousand, six hundred forty-six".