61898520 has 128 divisors (see below), whose sum is σ = 198858240. Its totient is φ = 15375360.

The previous prime is 61898519. The next prime is 61898531. The reversal of 61898520 is 2589816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112887 + ... + 113433.

It is an arithmetic number, because the mean of its divisors is an integer number (1553580).

Almost surely, 2^61898520 is an apocalyptic number.

61898520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61898520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99429120).

61898520 is an abundant number, since it is smaller than the sum of its proper divisors (136959720).

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

61898520 is a wasteful number, since it uses less digits than its factorization.

61898520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 61898520 is about 7867.5612485700. The cubic root of 61898520 is about 395.5731038847.

The spelling of 61898520 in words is "sixty-one million, eight hundred ninety-eight thousand, five hundred twenty".