161077640 has 32 divisors (see below), whose sum is σ = 363242880. Its totient is φ = 64285632.

The previous prime is 161077633. The next prime is 161077673. The reversal of 161077640 is 46770161.

It is a happy number.

It is a super-2 number, since 2×161077640² = 51892012215939200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161077597 and 161077606.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14369 + ... + 22991.

It is an arithmetic number, because the mean of its divisors is an integer number (11351340).

Almost surely, 2^161077640 is an apocalyptic number.

161077640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161077640 is an abundant number, since it is smaller than the sum of its proper divisors (202165240).

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

161077640 is a wasteful number, since it uses less digits than its factorization.

161077640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9101 (or 9097 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 161077640 is about 12691.6366162918. The cubic root of 161077640 is about 544.0996159126.

The spelling of 161077640 in words is "one hundred sixty-one million, seventy-seven thousand, six hundred forty".