155520620 has 48 divisors (see below), whose sum is σ = 347034240. Its totient is φ = 58431744.

The previous prime is 155520613. The next prime is 155520653. The reversal of 155520620 is 26025551.

It is a self number, because there is not a number n which added to its sum of digits gives 155520620.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17837 + ... + 25083.

It is an arithmetic number, because the mean of its divisors is an integer number (7229880).

Almost surely, 2^155520620 is an apocalyptic number.

155520620 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 155520620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173517120).

155520620 is an abundant number, since it is smaller than the sum of its proper divisors (191513620).

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

155520620 is a wasteful number, since it uses less digits than its factorization.

155520620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322 (or 7320 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 155520620 is about 12470.7906726077. The cubic root of 155520620 is about 537.7692842132.

The spelling of 155520620 in words is "one hundred fifty-five million, five hundred twenty thousand, six hundred twenty".