87790645 has 8 divisors (see below), whose sum is σ = 106047360. Its totient is φ = 69766800.

The previous prime is 87790597. The next prime is 87790657. The reversal of 87790645 is 54609778.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87790645 - 2²¹ = 85693493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87790595 and 87790604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57385 + ... + 58894.

It is an arithmetic number, because the mean of its divisors is an integer number (13255920).

Almost surely, 2^87790645 is an apocalyptic number.

It is an amenable number.

87790645 is a deficient number, since it is larger than the sum of its proper divisors (18256715).

87790645 is a wasteful number, since it uses less digits than its factorization.

87790645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116435.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 87790645 is about 9369.6662160399. Note that the first 3 decimals coincide. The cubic root of 87790645 is about 444.4430097292.

The spelling of 87790645 in words is "eighty-seven million, seven hundred ninety thousand, six hundred forty-five".