155215320 has 64 divisors (see below), whose sum is σ = 501469920. Its totient is φ = 38206464.

The previous prime is 155215297. The next prime is 155215343. The reversal of 155215320 is 23512551.

Added to its reverse (23512551) it gives a triangular number (178727871 = T₁₈₉₀₆).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155215297) and next prime (155215343).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 48189 + ... + 51308.

Almost surely, 2^155215320 is an apocalyptic number.

155215320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155215320 is an abundant number, since it is smaller than the sum of its proper divisors (346254600).

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

155215320 is a wasteful number, since it uses less digits than its factorization.

155215320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99524 (or 99520 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 155215320 is about 12458.5440561889. The cubic root of 155215320 is about 537.4171583162.

Adding to 155215320 its reverse (23512551), we get a palindrome (178727871).

The spelling of 155215320 in words is "one hundred fifty-five million, two hundred fifteen thousand, three hundred twenty".