161552280 has 64 divisors (see below), whose sum is σ = 485727840. Its totient is φ = 42985472.

The previous prime is 161552267. The next prime is 161552291. The reversal of 161552280 is 82255161.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 65632 + ... + 68048.

Almost surely, 2^161552280 is an apocalyptic number.

161552280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161552280 is an abundant number, since it is smaller than the sum of its proper divisors (324175560).

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

161552280 is a wasteful number, since it uses less digits than its factorization.

161552280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2988 (or 2984 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 161552280 is about 12710.3217897896. The cubic root of 161552280 is about 544.6335162043.

The spelling of 161552280 in words is "one hundred sixty-one million, five hundred fifty-two thousand, two hundred eighty".