155572780 has 48 divisors (see below), whose sum is σ = 377377056. Its totient is φ = 53242880.

The previous prime is 155572777. The next prime is 155572783. The reversal of 155572780 is 87275551.

It is an interprime number because it is at equal distance from previous prime (155572777) and next prime (155572783).

It is not an unprimeable number, because it can be changed into a prime (155572783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17059 + ... + 24538.

It is an arithmetic number, because the mean of its divisors is an integer number (7862022).

Almost surely, 2^155572780 is an apocalyptic number.

155572780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155572780 is an abundant number, since it is smaller than the sum of its proper divisors (221804276).

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

155572780 is a wasteful number, since it uses less digits than its factorization.

155572780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41634 (or 41632 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 40.

The square root of 155572780 is about 12472.8817840946. The cubic root of 155572780 is about 537.8293982366.

The spelling of 155572780 in words is "one hundred fifty-five million, five hundred seventy-two thousand, seven hundred eighty".