73978491 has 8 divisors (see below), whose sum is σ = 99746640. Its totient is φ = 48764672.

The previous prime is 73978477. The next prime is 73978537. The reversal of 73978491 is 19487937.

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

It is a cyclic number.

It is not a de Polignac number, because 73978491 - 2⁷ = 73978363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73978491.

It is not an unprimeable number, because it can be changed into a prime (73978291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138270 + ... + 138803.

It is an arithmetic number, because the mean of its divisors is an integer number (12468330).

Almost surely, 2^73978491 is an apocalyptic number.

73978491 is a deficient number, since it is larger than the sum of its proper divisors (25768149).

73978491 is a wasteful number, since it uses less digits than its factorization.

73978491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277165.

The product of its digits is 381024, while the sum is 48.

The square root of 73978491 is about 8601.0749909532. The cubic root of 73978491 is about 419.7929648541.

The spelling of 73978491 in words is "seventy-three million, nine hundred seventy-eight thousand, four hundred ninety-one".