87991629 has 16 divisors (see below), whose sum is σ = 133553664. Its totient is φ = 51009200.

The previous prime is 87991627. The next prime is 87991633. The reversal of 87991629 is 92619978.

It is a happy number.

It is not a de Polignac number, because 87991629 - 2¹ = 87991627 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87991621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57207 + ... + 58724.

It is an arithmetic number, because the mean of its divisors is an integer number (8347104).

Almost surely, 2^87991629 is an apocalyptic number.

It is an amenable number.

87991629 is a deficient number, since it is larger than the sum of its proper divisors (45562035).

87991629 is a wasteful number, since it uses less digits than its factorization.

87991629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115968.

The product of its digits is 489888, while the sum is 51.

The square root of 87991629 is about 9380.3853332366. The cubic root of 87991629 is about 444.7819139262.

The spelling of 87991629 in words is "eighty-seven million, nine hundred ninety-one thousand, six hundred twenty-nine".