155729280 has 128 divisors (see below), whose sum is σ = 567348480. Its totient is φ = 35592192.

The previous prime is 155729269. The next prime is 155729291. The reversal of 155729280 is 82927551.

It is an interprime number because it is at equal distance from previous prime (155729269) and next prime (155729291).

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7647 + ... + 19233.

It is an arithmetic number, because the mean of its divisors is an integer number (4432410).

Almost surely, 2^155729280 is an apocalyptic number.

155729280 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 155729280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283674240).

155729280 is an abundant number, since it is smaller than the sum of its proper divisors (411619200).

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

155729280 is a wasteful number, since it uses less digits than its factorization.

155729280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11616 (or 11604 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 155729280 is about 12479.1538174670. The cubic root of 155729280 is about 538.0096827581.

The spelling of 155729280 in words is "one hundred fifty-five million, seven hundred twenty-nine thousand, two hundred eighty".