61528590 has 24 divisors (see below), whose sum is σ = 159974568. Its totient is φ = 16407600.

The previous prime is 61528501. The next prime is 61528591. The reversal of 61528590 is 9582516.

It is a happy number.

61528590 is a `hidden beast` number, since 61 + 5 + 2 + 8 + 590 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61528591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341736 + ... + 341915.

It is an arithmetic number, because the mean of its divisors is an integer number (6665607).

Almost surely, 2^61528590 is an apocalyptic number.

61528590 is an abundant number, since it is smaller than the sum of its proper divisors (98445978).

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

61528590 is a wasteful number, since it uses less digits than its factorization.

61528590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683664 (or 683661 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 61528590 is about 7844.0161907023. The cubic root of 61528590 is about 394.7834950895.

The spelling of 61528590 in words is "sixty-one million, five hundred twenty-eight thousand, five hundred ninety".