90944978729 has 4 divisors (see below), whose sum is σ = 99212704080. Its totient is φ = 82677253380.

The previous prime is 90944978717. The next prime is 90944978731. The reversal of 90944978729 is 92787944909.

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 not a de Polignac number, because 90944978729 - 2¹⁶ = 90944913193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90944978759) 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, 4133862659 + ... + 4133862680.

It is an arithmetic number, because the mean of its divisors is an integer number (24803176020).

Almost surely, 2^90944978729 is an apocalyptic number.

It is an amenable number.

90944978729 is a deficient number, since it is larger than the sum of its proper divisors (8267725351).

90944978729 is a wasteful number, since it uses less digits than its factorization.

90944978729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8267725350.

The product of its (nonzero) digits is 82301184, while the sum is 68.

The spelling of 90944978729 in words is "ninety billion, nine hundred forty-four million, nine hundred seventy-eight thousand, seven hundred twenty-nine".