87051669 has 16 divisors (see below), whose sum is σ = 118056960. Its totient is φ = 57049200.

The previous prime is 87051667. The next prime is 87051683. The reversal of 87051669 is 96615078.

It is not a de Polignac number, because 87051669 - 2¹ = 87051667 is a prime.

It is a super-2 number, since 2×87051669² = 15155986151371122, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87051669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87051667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43644 + ... + 45594.

It is an arithmetic number, because the mean of its divisors is an integer number (7378560).

Almost surely, 2^87051669 is an apocalyptic number.

It is an amenable number.

87051669 is a deficient number, since it is larger than the sum of its proper divisors (31005291).

87051669 is a wasteful number, since it uses less digits than its factorization.

87051669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 87051669 is about 9330.1483911029. The cubic root of 87051669 is about 443.1924642731.

The spelling of 87051669 in words is "eighty-seven million, fifty-one thousand, six hundred sixty-nine".