87780489 has 16 divisors (see below), whose sum is σ = 122425344. Its totient is φ = 55840400.

The previous prime is 87780487. The next prime is 87780491. The reversal of 87780489 is 98408778.

It is an interprime number because it is at equal distance from previous prime (87780487) and next prime (87780491).

It is a cyclic number.

It is not a de Polignac number, because 87780489 - 2¹ = 87780487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87780487) 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, 32584 + ... + 35174.

It is an arithmetic number, because the mean of its divisors is an integer number (7651584).

Almost surely, 2^87780489 is an apocalyptic number.

It is an amenable number.

87780489 is a deficient number, since it is larger than the sum of its proper divisors (34644855).

87780489 is a wasteful number, since it uses less digits than its factorization.

87780489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108.

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 87780489 is about 9369.1242386895. The cubic root of 87780489 is about 444.4258707076.

The spelling of 87780489 in words is "eighty-seven million, seven hundred eighty thousand, four hundred eighty-nine".