87429890 has 16 divisors (see below), whose sum is σ = 161627832. Its totient is φ = 34026624.

The previous prime is 87429871. The next prime is 87429893. The reversal of 87429890 is 9892478.

It can be written as a sum of positive squares in 4 ways, for example, as 60171049 + 27258841 = 7757^2 + 5221^2 .

It is not an unprimeable number, because it can be changed into a prime (87429893) 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, 117779 + ... + 118518.

Almost surely, 2^87429890 is an apocalyptic number.

87429890 is a deficient number, since it is larger than the sum of its proper divisors (74197942).

87429890 is a wasteful number, since it uses less digits than its factorization.

87429890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236341.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 87429890 is about 9350.3951788146. The cubic root of 87429890 is about 443.8333959507.

The spelling of 87429890 in words is "eighty-seven million, four hundred twenty-nine thousand, eight hundred ninety".