158640987 has 8 divisors (see below), whose sum is σ = 213898320. Its totient is φ = 104572160.

The previous prime is 158640973. The next prime is 158640997. The reversal of 158640987 is 789046851.

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

It is a cyclic number.

It is not a de Polignac number, because 158640987 - 2⁸ = 158640731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158640917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296814 + ... + 297347.

It is an arithmetic number, because the mean of its divisors is an integer number (26737290).

Almost surely, 2^158640987 is an apocalyptic number.

158640987 is a deficient number, since it is larger than the sum of its proper divisors (55257333).

158640987 is an equidigital number, since it uses as much as digits as its factorization.

158640987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594253.

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 158640987 is about 12595.2763764834. The cubic root of 158640987 is about 541.3420971633.

The spelling of 158640987 in words is "one hundred fifty-eight million, six hundred forty thousand, nine hundred eighty-seven".