161920750 has 64 divisors (see below), whose sum is σ = 331568640. Its totient is φ = 58944000.

The previous prime is 161920739. The next prime is 161920753. The reversal of 161920750 is 57029161.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161920753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131136 + ... + 132364.

It is an arithmetic number, because the mean of its divisors is an integer number (5180760).

Almost surely, 2^161920750 is an apocalyptic number.

161920750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161920750 is an abundant number, since it is smaller than the sum of its proper divisors (169647890).

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

161920750 is a wasteful number, since it uses less digits than its factorization.

161920750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 161920750 is about 12724.8084464954. The cubic root of 161920750 is about 545.0472702595.

The spelling of 161920750 in words is "one hundred sixty-one million, nine hundred twenty thousand, seven hundred fifty".