155225700 has 288 divisors, whose sum is σ = 586629120. Its totient is φ = 34473600.

The previous prime is 155225677. The next prime is 155225723. The reversal of 155225700 is 7522551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155225677) and next prime (155225723).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 812605 + ... + 812795.

Almost surely, 2^155225700 is an apocalyptic number.

155225700 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 155225700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293314560).

155225700 is an abundant number, since it is smaller than the sum of its proper divisors (431403420).

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

155225700 is a wasteful number, since it uses less digits than its factorization.

155225700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 155225700 is about 12458.9606308070. The cubic root of 155225700 is about 537.4291379450.

The spelling of 155225700 in words is "one hundred fifty-five million, two hundred twenty-five thousand, seven hundred".