528778973 has 6 divisors (see below), whose sum is σ = 535233534. Its totient is φ = 522401336.

The previous prime is 528778969. The next prime is 528779071. The reversal of 528778973 is 379877825.

It can be written as a sum of positive squares in only one way, i.e., 517198564 + 11580409 = 22742^2 + 3403^2 .

It is not a de Polignac number, because 528778973 - 2² = 528778969 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528778903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31490 + ... + 45267.

It is an arithmetic number, because the mean of its divisors is an integer number (89205589).

Almost surely, 2^528778973 is an apocalyptic number.

It is an amenable number.

528778973 is a deficient number, since it is larger than the sum of its proper divisors (6454561).

528778973 is an frugal number, since it uses more digits than its factorization.

528778973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76923 (or 76840 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 56.

The square root of 528778973 is about 22995.1945632125. The cubic root of 528778973 is about 808.6452856915.

The spelling of 528778973 in words is "five hundred twenty-eight million, seven hundred seventy-eight thousand, nine hundred seventy-three".