155540320 has 48 divisors (see below), whose sum is σ = 395735760. Its totient is φ = 57429504.

The previous prime is 155540317. The next prime is 155540323. The reversal of 155540320 is 23045551.

It is an interprime number because it is at equal distance from previous prime (155540317) and next prime (155540323).

It is a super-2 number, since 2×155540320² = 48385582291404800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155540323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35310 + ... + 39469.

It is an arithmetic number, because the mean of its divisors is an integer number (8244495).

Almost surely, 2^155540320 is an apocalyptic number.

155540320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155540320 is an abundant number, since it is smaller than the sum of its proper divisors (240195440).

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

155540320 is a wasteful number, since it uses less digits than its factorization.

155540320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74807 (or 74799 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 155540320 is about 12471.5804932655. The cubic root of 155540320 is about 537.7919899003.

Adding to 155540320 its reverse (23045551), we get a palindrome (178585871).

The spelling of 155540320 in words is "one hundred fifty-five million, five hundred forty thousand, three hundred twenty".