87155709 has 8 divisors (see below), whose sum is σ = 119042112. Its totient is φ = 56686560.

The previous prime is 87155707. The next prime is 87155749. The reversal of 87155709 is 90755178.

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

It is not a de Polignac number, because 87155709 - 2¹ = 87155707 is a prime.

It is a super-2 number, since 2×87155709² = 15192235222585362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87155707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354169 + ... + 354414.

It is an arithmetic number, because the mean of its divisors is an integer number (14880264).

Almost surely, 2^87155709 is an apocalyptic number.

It is an amenable number.

87155709 is a deficient number, since it is larger than the sum of its proper divisors (31886403).

87155709 is a wasteful number, since it uses less digits than its factorization.

87155709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708627.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 87155709 is about 9335.7222002371. The cubic root of 87155709 is about 443.3689548076.

The spelling of 87155709 in words is "eighty-seven million, one hundred fifty-five thousand, seven hundred nine".