28953404649 has 27 divisors (see below), whose sum is σ = 45296476407. Its totient is φ = 17813396016.

The previous prime is 28953404639. The next prime is 28953404677. The reversal of 28953404649 is 94640435982.

The square root of 28953404649 is 170157.

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

28953404649 is a `hidden beast` number, since 28 + 9 + 534 + 0 + 46 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4283048025 + 24670356624 = 65445^2 + 157068^2 .

It is not a de Polignac number, because 28953404649 - 2¹¹ = 28953402601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28953404595 and 28953404604.

It is not an unprimeable number, because it can be changed into a prime (28953404629) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6633942 + ... + 6638304.

Almost surely, 2^28953404649 is an apocalyptic number.

28953404649 is the 170157-th square number.

28953404649 is the 85079-th centered octagonal number.

It is an amenable number.

28953404649 is a deficient number, since it is larger than the sum of its proper divisors (16343071758).

28953404649 is an frugal number, since it uses more digits than its factorization.

28953404649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8758 (or 4379 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 28953404649 in words is "twenty-eight billion, nine hundred fifty-three million, four hundred four thousand, six hundred forty-nine".