87880729 has 2 divisors, whose sum is σ = 87880730. Its totient is φ = 87880728.

The previous prime is 87880703. The next prime is 87880801. The reversal of 87880729 is 92708878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58936329 + 28944400 = 7677^2 + 5380^2 .

It is a cyclic number.

It is not a de Polignac number, because 87880729 - 2⁷ = 87880601 is a prime.

It is not a weakly prime, because it can be changed into another prime (87880129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43940364 + 43940365.

It is an arithmetic number, because the mean of its divisors is an integer number (43940365).

Almost surely, 2^87880729 is an apocalyptic number.

It is an amenable number.

87880729 is a deficient number, since it is larger than the sum of its proper divisors (1).

87880729 is an equidigital number, since it uses as much as digits as its factorization.

87880729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 87880729 is about 9374.4721984760. The cubic root of 87880729 is about 444.5949754939.

The spelling of 87880729 in words is "eighty-seven million, eight hundred eighty thousand, seven hundred twenty-nine".