87661428 has 48 divisors (see below), whose sum is σ = 214179840. Its totient is φ = 27871200.

The previous prime is 87661373. The next prime is 87661447. The reversal of 87661428 is 82416678.

It is a self number, because there is not a number n which added to its sum of digits gives 87661428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24753 + ... + 28071.

It is an arithmetic number, because the mean of its divisors is an integer number (4462080).

Almost surely, 2^87661428 is an apocalyptic number.

It is an amenable number.

87661428 is an abundant number, since it is smaller than the sum of its proper divisors (126518412).

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

87661428 is a wasteful number, since it uses less digits than its factorization.

87661428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428 (or 3426 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 87661428 is about 9362.7681804048. The cubic root of 87661428 is about 444.2248475629.

The spelling of 87661428 in words is "eighty-seven million, six hundred sixty-one thousand, four hundred twenty-eight".