155228990 has 16 divisors (see below), whose sum is σ = 319328352. Its totient is φ = 53221344.

The previous prime is 155228987. The next prime is 155228999. The reversal of 155228990 is 99822551.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155228999) 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 7 ways as a sum of consecutive naturals, for example, 1108709 + ... + 1108848.

It is an arithmetic number, because the mean of its divisors is an integer number (19958022).

Almost surely, 2^155228990 is an apocalyptic number.

155228990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155228990 is an abundant number, since it is smaller than the sum of its proper divisors (164099362).

155228990 is a wasteful number, since it uses less digits than its factorization.

155228990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217571.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 155228990 is about 12459.0926635931. The cubic root of 155228990 is about 537.4329348450.

The spelling of 155228990 in words is "one hundred fifty-five million, two hundred twenty-eight thousand, nine hundred ninety".