87620409 has 12 divisors (see below), whose sum is σ = 132065856. Its totient is φ = 55873752.

The previous prime is 87620399. The next prime is 87620417. The reversal of 87620409 is 90402678.

It is not a de Polignac number, because 87620409 - 2¹¹ = 87618361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87620009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211437 + ... + 211850.

It is an arithmetic number, because the mean of its divisors is an integer number (11005488).

Almost surely, 2^87620409 is an apocalyptic number.

It is an amenable number.

87620409 is a deficient number, since it is larger than the sum of its proper divisors (44445447).

87620409 is a wasteful number, since it uses less digits than its factorization.

87620409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423316 (or 423313 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 87620409 is about 9360.5773860377. The cubic root of 87620409 is about 444.1555487378.

The spelling of 87620409 in words is "eighty-seven million, six hundred twenty thousand, four hundred nine".