87049991 has 8 divisors (see below), whose sum is σ = 100270080. Its totient is φ = 74026008.

The previous prime is 87049973. The next prime is 87049993. The reversal of 87049991 is 19994078.

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

It is not a de Polignac number, because 87049991 - 2⁶ = 87049927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87049993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48071 + ... + 49848.

It is an arithmetic number, because the mean of its divisors is an integer number (12533760).

Almost surely, 2^87049991 is an apocalyptic number.

87049991 is a deficient number, since it is larger than the sum of its proper divisors (13220089).

87049991 is a wasteful number, since it uses less digits than its factorization.

87049991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98053.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 87049991 is about 9330.0584671266. The cubic root of 87049991 is about 443.1896166090.

The spelling of 87049991 in words is "eighty-seven million, forty-nine thousand, nine hundred ninety-one".