149217728 has 56 divisors (see below), whose sum is σ = 327233280. Its totient is φ = 66942720.

The previous prime is 149217727. The next prime is 149217763. The reversal of 149217728 is 827712941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149217727) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54275 + ... + 56957.

Almost surely, 2^149217728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 149217728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163616640).

149217728 is an abundant number, since it is smaller than the sum of its proper divisors (178015552).

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

149217728 is a wasteful number, since it uses less digits than its factorization.

149217728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785 (or 2775 counting only the distinct ones).

The product of its digits is 56448, while the sum is 41.

The square root of 149217728 is about 12215.4708464308. The cubic root of 149217728 is about 530.4040208779.

The spelling of 149217728 in words is "one hundred forty-nine million, two hundred seventeen thousand, seven hundred twenty-eight".