87640445 has 8 divisors (see below), whose sum is σ = 110703840. Its totient is φ = 66422160.

The previous prime is 87640439. The next prime is 87640451. The reversal of 87640445 is 54404678.

It is an interprime number because it is at equal distance from previous prime (87640439) and next prime (87640451).

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

It is a de Polignac number, because none of the positive numbers 2^k-87640445 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87640399 and 87640408.

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, 461171 + ... + 461360.

It is an arithmetic number, because the mean of its divisors is an integer number (13837980).

Almost surely, 2^87640445 is an apocalyptic number.

It is an amenable number.

87640445 is a deficient number, since it is larger than the sum of its proper divisors (23063395).

87640445 is a wasteful number, since it uses less digits than its factorization.

87640445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922555.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 87640445 is about 9361.6475579889. The cubic root of 87640445 is about 444.1894009056.

The spelling of 87640445 in words is "eighty-seven million, six hundred forty thousand, four hundred forty-five".