155947680 has 336 divisors, whose sum is σ = 634604544. Its totient is φ = 35458560.

The previous prime is 155947657. The next prime is 155947709. The reversal of 155947680 is 86749551.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 55 ways as a sum of consecutive naturals, for example, 816385 + ... + 816575.

It is an arithmetic number, because the mean of its divisors is an integer number (1888704).

Almost surely, 2^155947680 is an apocalyptic number.

155947680 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 155947680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317302272).

155947680 is an abundant number, since it is smaller than the sum of its proper divisors (478656864).

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

155947680 is an equidigital number, since it uses as much as digits as its factorization.

155947680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 155947680 is about 12487.9013449018. The cubic root of 155947680 is about 538.2610729231.

The spelling of 155947680 in words is "one hundred fifty-five million, nine hundred forty-seven thousand, six hundred eighty".