1615615120 has 80 divisors (see below), whose sum is σ = 4308617088. Its totient is φ = 551900160.

The previous prime is 1615615109. The next prime is 1615615121. The reversal of 1615615120 is 215165161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1615615120² = 5220424431945228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1615615121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152227 + ... + 162493.

Almost surely, 2^1615615120 is an apocalyptic number.

1615615120 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 1615615120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2154308544).

1615615120 is an abundant number, since it is smaller than the sum of its proper divisors (2693001968).

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

1615615120 is a wasteful number, since it uses less digits than its factorization.

1615615120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10568 (or 10562 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1615615120 is about 40194.7150754922. The cubic root of 1615615120 is about 1173.3996913515.

The spelling of 1615615120 in words is "one billion, six hundred fifteen million, six hundred fifteen thousand, one hundred twenty".