78491958 has 48 divisors (see below), whose sum is σ = 171524304. Its totient is φ = 23848960.

The previous prime is 78491953. The next prime is 78491971. The reversal of 78491958 is 85919487.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78491958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78491953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 572866 + ... + 573002.

It is an arithmetic number, because the mean of its divisors is an integer number (3573423).

Almost surely, 2^78491958 is an apocalyptic number.

78491958 is an abundant number, since it is smaller than the sum of its proper divisors (93032346).

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

78491958 is a wasteful number, since it uses less digits than its factorization.

78491958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 200 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 78491958 is about 8859.5687253952. The cubic root of 78491958 is about 428.1622634232.

The spelling of 78491958 in words is "seventy-eight million, four hundred ninety-one thousand, nine hundred fifty-eight".