1061515620 has 144 divisors (see below), whose sum is σ = 3549506688. Its totient is φ = 254638080.

The previous prime is 1061515519. The next prime is 1061515621. The reversal of 1061515620 is 265151601.

It is a happy number.

1061515620 is a `hidden beast` number, since 10 + 6 + 15 + 15 + 620 = 666.

It is a super-2 number, since 2×1061515620² = 2253630823007968800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1061515621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189297 + ... + 194823.

It is an arithmetic number, because the mean of its divisors is an integer number (24649352).

Almost surely, 2^1061515620 is an apocalyptic number.

1061515620 is a gapful number since it is divisible by the number (10) 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 1061515620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1774753344).

1061515620 is an abundant number, since it is smaller than the sum of its proper divisors (2487991068).

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

1061515620 is a wasteful number, since it uses less digits than its factorization.

1061515620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650 (or 5645 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1061515620 is about 32580.9088271030. The cubic root of 1061515620 is about 1020.0985487251.

The spelling of 1061515620 in words is "one billion, sixty-one million, five hundred fifteen thousand, six hundred twenty".