99729457 has 4 divisors (see below), whose sum is σ = 100661616. Its totient is φ = 98797300.

The previous prime is 99729439. The next prime is 99729473. The reversal of 99729457 is 75492799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99729457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99729437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465919 + ... + 466132.

It is an arithmetic number, because the mean of its divisors is an integer number (25165404).

Almost surely, 2^99729457 is an apocalyptic number.

It is an amenable number.

99729457 is a deficient number, since it is larger than the sum of its proper divisors (932159).

99729457 is a wasteful number, since it uses less digits than its factorization.

99729457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932158.

The product of its digits is 1428840, while the sum is 52.

The square root of 99729457 is about 9986.4636884134. The cubic root of 99729457 is about 463.7399221878.

The spelling of 99729457 in words is "ninety-nine million, seven hundred twenty-nine thousand, four hundred fifty-seven".