161403672 has 16 divisors (see below), whose sum is σ = 403509240. Its totient is φ = 53801216.

The previous prime is 161403643. The next prime is 161403677. The reversal of 161403672 is 276304161.

161403672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161403672² = 52102290670167168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161403677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3362553 + ... + 3362600.

Almost surely, 2^161403672 is an apocalyptic number.

161403672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161403672 is an abundant number, since it is smaller than the sum of its proper divisors (242105568).

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

161403672 is a wasteful number, since it uses less digits than its factorization.

161403672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6725162 (or 6725158 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 161403672 is about 12704.4744873607. The cubic root of 161403672 is about 544.4664666120.

The spelling of 161403672 in words is "one hundred sixty-one million, four hundred three thousand, six hundred seventy-two".