88400729 has 4 divisors (see below), whose sum is σ = 91449060. Its totient is φ = 85352400.

The previous prime is 88400701. The next prime is 88400743. The reversal of 88400729 is 92700488.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39400729 + 49000000 = 6277^2 + 7000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88400729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 88400692 and 88400701.

It is not an unprimeable number, because it can be changed into a prime (88400789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1524122 + ... + 1524179.

It is an arithmetic number, because the mean of its divisors is an integer number (22862265).

Almost surely, 2^88400729 is an apocalyptic number.

It is an amenable number.

88400729 is a deficient number, since it is larger than the sum of its proper divisors (3048331).

88400729 is a wasteful number, since it uses less digits than its factorization.

88400729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048330.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 88400729 is about 9402.1661865764. The cubic root of 88400729 is about 445.4701574665.

The spelling of 88400729 in words is "eighty-eight million, four hundred thousand, seven hundred twenty-nine".