155562220 has 48 divisors (see below), whose sum is σ = 359958816. Its totient is φ = 56000000.

The previous prime is 155562203. The next prime is 155562227. The reversal of 155562220 is 22265551.

It is not an unprimeable number, because it can be changed into a prime (155562227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 18720 + ... + 25720.

It is an arithmetic number, because the mean of its divisors is an integer number (7499142).

Almost surely, 2^155562220 is an apocalyptic number.

155562220 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 155562220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179979408).

155562220 is an abundant number, since it is smaller than the sum of its proper divisors (204396596).

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

155562220 is a wasteful number, since it uses less digits than its factorization.

155562220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7122 (or 7120 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 155562220 is about 12472.4584585398. The cubic root of 155562220 is about 537.8172289977.

The spelling of 155562220 in words is "one hundred fifty-five million, five hundred sixty-two thousand, two hundred twenty".