78321832 has 8 divisors (see below), whose sum is σ = 146853450. Its totient is φ = 39160912.

The previous prime is 78321829. The next prime is 78321847. The reversal of 78321832 is 23812387.

It can be written as a sum of positive squares in only one way, i.e., 41912676 + 36409156 = 6474^2 + 6034^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78321832² = 12268618735672448, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4895107 + ... + 4895122.

Almost surely, 2^78321832 is an apocalyptic number.

It is an amenable number.

78321832 is a deficient number, since it is larger than the sum of its proper divisors (68531618).

78321832 is a wasteful number, since it uses less digits than its factorization.

78321832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9790235 (or 9790231 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 78321832 is about 8849.9622598065. The cubic root of 78321832 is about 427.8527021004.

The spelling of 78321832 in words is "seventy-eight million, three hundred twenty-one thousand, eight hundred thirty-two".