155729680 has 20 divisors (see below), whose sum is σ = 362071692. Its totient is φ = 62291840.

The previous prime is 155729669. The next prime is 155729683. The reversal of 155729680 is 86927551.

It can be written as a sum of positive squares in 2 ways, for example, as 43454464 + 112275216 = 6592^2 + 10596^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (155729683) 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 3 ways as a sum of consecutive naturals, for example, 973231 + ... + 973390.

Almost surely, 2^155729680 is an apocalyptic number.

155729680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155729680 is an abundant number, since it is smaller than the sum of its proper divisors (206342012).

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

155729680 is a wasteful number, since it uses less digits than its factorization.

155729680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946634 (or 1946628 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 155729680 is about 12479.1698441843. The cubic root of 155729680 is about 538.0101433944.

It can be divided in two parts, 15572 and 9680, that added together give a palindrome (25252).

The spelling of 155729680 in words is "one hundred fifty-five million, seven hundred twenty-nine thousand, six hundred eighty".