87769505 has 16 divisors (see below), whose sum is σ = 107163648. Its totient is φ = 69000000.

The previous prime is 87769501. The next prime is 87769543. The reversal of 87769505 is 50596778.

It is a happy number.

It is not a de Polignac number, because 87769505 - 2² = 87769501 is a prime.

It is a Duffinian number.

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 87769505.

It is not an unprimeable number, because it can be changed into a prime (87769501) 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, 75680 + ... + 76830.

It is an arithmetic number, because the mean of its divisors is an integer number (6697728).

Almost surely, 2^87769505 is an apocalyptic number.

It is an amenable number.

87769505 is a deficient number, since it is larger than the sum of its proper divisors (19394143).

87769505 is a wasteful number, since it uses less digits than its factorization.

87769505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 87769505 is about 9368.5380396303. The cubic root of 87769505 is about 444.4073328850.

It can be divided in two parts, 8776 and 9505, that added together give a palindrome (18281).

The spelling of 87769505 in words is "eighty-seven million, seven hundred sixty-nine thousand, five hundred five".