181478964 has 12 divisors (see below), whose sum is σ = 423450944. Its totient is φ = 60492984.

The previous prime is 181478959. The next prime is 181478977. The reversal of 181478964 is 469874181.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×181478964² = 65869228749026592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7561612 + ... + 7561635.

Almost surely, 2^181478964 is an apocalyptic number.

It is an amenable number.

181478964 is an abundant number, since it is smaller than the sum of its proper divisors (241971980).

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

181478964 is a wasteful number, since it uses less digits than its factorization.

181478964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15123254 (or 15123252 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 181478964 is about 13471.4128434994. The cubic root of 181478964 is about 566.1637994791.

The spelling of 181478964 in words is "one hundred eighty-one million, four hundred seventy-eight thousand, nine hundred sixty-four".