161777088 has 140 divisors (see below), whose sum is σ = 523338552. Its totient is φ = 49006080.

The previous prime is 161777059. The next prime is 161777089. The reversal of 161777088 is 880777161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161777089) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 55606 + ... + 58442.

Almost surely, 2^161777088 is an apocalyptic number.

161777088 is a gapful number since it is divisible by the number (18) 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 161777088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261669276).

161777088 is an abundant number, since it is smaller than the sum of its proper divisors (361561464).

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

161777088 is a wasteful number, since it uses less digits than its factorization.

161777088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872 (or 2853 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 45.

The square root of 161777088 is about 12719.1622365626. The cubic root of 161777088 is about 544.8860272852.

The spelling of 161777088 in words is "one hundred sixty-one million, seven hundred seventy-seven thousand, eighty-eight".