73978 has 8 divisors (see below), whose sum is σ = 113472. Its totient is φ = 36156.

The previous prime is 73973. The next prime is 73999. The reversal of 73978 is 87937.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (73973) 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, 300 + ... + 487.

It is an arithmetic number, because the mean of its divisors is an integer number (14184).

2⁷³⁹⁷⁸ is an apocalyptic number.

73978 is a deficient number, since it is larger than the sum of its proper divisors (39494).

73978 is a wasteful number, since it uses less digits than its factorization.

73978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836.

The product of its digits is 10584, while the sum is 34.

The square root of 73978 is about 271.9889703646. The cubic root of 73978 is about 41.9792036121.

The spelling of 73978 in words is "seventy-three thousand, nine hundred seventy-eight".