155220480 has 120 divisors (see below), whose sum is σ = 537651972. Its totient is φ = 41385984.

The previous prime is 155220479. The next prime is 155220487. The reversal of 155220480 is 84022551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 154554624 + 665856 = 12432^2 + 816^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×155220480² = 48186794822860800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155220487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19672 + ... + 26408.

Almost surely, 2^155220480 is an apocalyptic number.

155220480 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 155220480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268825986).

155220480 is an abundant number, since it is smaller than the sum of its proper divisors (382431492).

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

155220480 is an equidigital number, since it uses as much as digits as its factorization.

155220480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6766 (or 6747 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 155220480 is about 12458.7511412661. The cubic root of 155220480 is about 537.4231135742.

The spelling of 155220480 in words is "one hundred fifty-five million, two hundred twenty thousand, four hundred eighty".