87173649 has 12 divisors (see below), whose sum is σ = 127095696. Its totient is φ = 57571992.

The previous prime is 87173641. The next prime is 87173663. The reversal of 87173649 is 94637178.

It is not a de Polignac number, because 87173649 - 2³ = 87173641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87173641) 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, 44299 + ... + 46224.

It is an arithmetic number, because the mean of its divisors is an integer number (10591308).

Almost surely, 2^87173649 is an apocalyptic number.

It is an amenable number.

87173649 is a deficient number, since it is larger than the sum of its proper divisors (39922047).

87173649 is a wasteful number, since it uses less digits than its factorization.

87173649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90636 (or 90633 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 87173649 is about 9336.6829763037. The cubic root of 87173649 is about 443.3993735201.

The spelling of 87173649 in words is "eighty-seven million, one hundred seventy-three thousand, six hundred forty-nine".