525505578 has 48 divisors (see below), whose sum is σ = 1172379936. Its totient is φ = 156098880.

The previous prime is 525505517. The next prime is 525505579. The reversal of 525505578 is 875505525.

It is a super-2 number, since 2×525505578² = 552312225018228168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (525505579) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61593 + ... + 69603.

It is an arithmetic number, because the mean of its divisors is an integer number (24424582).

Almost surely, 2^525505578 is an apocalyptic number.

525505578 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 525505578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (586189968).

525505578 is an abundant number, since it is smaller than the sum of its proper divisors (646874358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

525505578 is a wasteful number, since it uses less digits than its factorization.

525505578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087 (or 8058 counting only the distinct ones).

The product of its (nonzero) digits is 350000, while the sum is 42.

The square root of 525505578 is about 22923.9084363902. The cubic root of 525505578 is about 806.9731967654.

The spelling of 525505578 in words is "five hundred twenty-five million, five hundred five thousand, five hundred seventy-eight".