87061644 has 18 divisors (see below), whose sum is σ = 220072580. Its totient is φ = 29020536.

The previous prime is 87061631. The next prime is 87061657. The reversal of 87061644 is 44616078.

87061644 is a `hidden beast` number, since 8 + 7 + 0 + 6 + 1 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (87061631) and next prime (87061657).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×87061644³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2418379 = 87061644 / (8 + 7 + 0 + 6 + 1 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 87061599 and 87061608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1209154 + ... + 1209225.

Almost surely, 2^87061644 is an apocalyptic number.

It is an amenable number.

87061644 is an abundant number, since it is smaller than the sum of its proper divisors (133010936).

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

87061644 is a wasteful number, since it uses less digits than its factorization.

87061644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418389 (or 2418384 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 87061644 is about 9330.6829332048. The cubic root of 87061644 is about 443.2093916759.

The spelling of 87061644 in words is "eighty-seven million, sixty-one thousand, six hundred forty-four".