61015020 has 96 divisors (see below), whose sum is σ = 187729920. Its totient is φ = 14684160.

The previous prime is 61015013. The next prime is 61015049. The reversal of 61015020 is 2051016.

61015020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127141 + ... + 127619.

It is an arithmetic number, because the mean of its divisors is an integer number (1955520).

Almost surely, 2^61015020 is an apocalyptic number.

61015020 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 61015020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93864960).

61015020 is an abundant number, since it is smaller than the sum of its proper divisors (126714900).

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

61015020 is a wasteful number, since it uses less digits than its factorization.

61015020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 61015020 is about 7811.2111736913. The cubic root of 61015020 is about 393.6820250509.

Adding to 61015020 its reverse (2051016), we get a palindrome (63066036).

The spelling of 61015020 in words is "sixty-one million, fifteen thousand, twenty".