87760405 has 4 divisors (see below), whose sum is σ = 105312492. Its totient is φ = 70208320.

The previous prime is 87760403. The next prime is 87760417. The reversal of 87760405 is 50406778.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50406778 = 2 ⋅25203389.

It can be written as a sum of positive squares in 2 ways, for example, as 66471409 + 21288996 = 8153^2 + 4614^2 .

It is not a de Polignac number, because 87760405 - 2¹ = 87760403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87760403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8776036 + ... + 8776045.

It is an arithmetic number, because the mean of its divisors is an integer number (26328123).

Almost surely, 2^87760405 is an apocalyptic number.

It is an amenable number.

87760405 is a deficient number, since it is larger than the sum of its proper divisors (17552087).

87760405 is a wasteful number, since it uses less digits than its factorization.

87760405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17552086.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 87760405 is about 9368.0523589485. The cubic root of 87760405 is about 444.3919735393.

The spelling of 87760405 in words is "eighty-seven million, seven hundred sixty thousand, four hundred five".