528978431 has 4 divisors (see below), whose sum is σ = 529072200. Its totient is φ = 528884664.

The previous prime is 528978407. The next prime is 528978469. The reversal of 528978431 is 134879825.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 528978431 - 2¹⁴ = 528962047 is a prime.

It is a super-2 number, since 2×528978431² = 559636360926443522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528978491) 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, 37841 + ... + 49898.

It is an arithmetic number, because the mean of its divisors is an integer number (132268050).

Almost surely, 2^528978431 is an apocalyptic number.

528978431 is a deficient number, since it is larger than the sum of its proper divisors (93769).

528978431 is an equidigital number, since it uses as much as digits as its factorization.

528978431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93768.

The product of its digits is 483840, while the sum is 47.

The square root of 528978431 is about 22999.5311039160. The cubic root of 528978431 is about 808.7469478882.

The spelling of 528978431 in words is "five hundred twenty-eight million, nine hundred seventy-eight thousand, four hundred thirty-one".