90978441980644 has 27 divisors (see below), whose sum is σ = 159481769254857. Its totient is φ = 45412352136864.

The previous prime is 90978441980627. The next prime is 90978441980651. The reversal of 90978441980644 is 44608914487909.

The square root of 90978441980644 is 9538262.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 74128139452900 + 16850302527744 = 8609770^2 + 4104912^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12266201224 + ... + 12266208640.

Almost surely, 2^{90978441980644} is an apocalyptic number.

90978441980644 is the 9538262-nd square number.

It is an amenable number.

90978441980644 is a deficient number, since it is larger than the sum of its proper divisors (68503327274213).

90978441980644 is an frugal number, since it uses more digits than its factorization.

90978441980644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16124 (or 8062 counting only the distinct ones).

The product of its (nonzero) digits is 501645312, while the sum is 73.

The spelling of 90978441980644 in words is "ninety trillion, nine hundred seventy-eight billion, four hundred forty-one million, nine hundred eighty thousand, six hundred forty-four".