155427720 has 128 divisors (see below), whose sum is σ = 546013440. Its totient is φ = 34652160.

The previous prime is 155427703. The next prime is 155427737. The reversal of 155427720 is 27724551.

It is an interprime number because it is at equal distance from previous prime (155427703) and next prime (155427737).

It is a super-2 number, since 2×155427720² = 48315552288796800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32184 + ... + 36696.

It is an arithmetic number, because the mean of its divisors is an integer number (4265730).

Almost surely, 2^155427720 is an apocalyptic number.

155427720 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 155427720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273006720).

155427720 is an abundant number, since it is smaller than the sum of its proper divisors (390585720).

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

155427720 is a wasteful number, since it uses less digits than its factorization.

155427720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4575 (or 4571 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 33.

The square root of 155427720 is about 12467.0654125179. The cubic root of 155427720 is about 537.6621843371.

The spelling of 155427720 in words is "one hundred fifty-five million, four hundred twenty-seven thousand, seven hundred twenty".