90712979 has 4 divisors (see below), whose sum is σ = 103671984. Its totient is φ = 77753976.

The previous prime is 90712949. The next prime is 90712981. The reversal of 90712979 is 97921709.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90712979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90712949) 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, 6479492 + ... + 6479505.

It is an arithmetic number, because the mean of its divisors is an integer number (25917996).

Almost surely, 2^90712979 is an apocalyptic number.

90712979 is a deficient number, since it is larger than the sum of its proper divisors (12959005).

90712979 is a wasteful number, since it uses less digits than its factorization.

90712979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12959004.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 90712979 is about 9524.3361448450. The cubic root of 90712979 is about 449.3207513615.

The spelling of 90712979 in words is "ninety million, seven hundred twelve thousand, nine hundred seventy-nine".