78273258 has 16 divisors (see below), whose sum is σ = 178910400. Its totient is φ = 22363776.

The previous prime is 78273211. The next prime is 78273259. The reversal of 78273258 is 85237287.

It is a super-2 number, since 2×78273258² = 12253405835869128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1863649 = 78273258 / (7 + 8 + 2 + 7 + 3 + 2 + 5 + 8).

It is not an unprimeable number, because it can be changed into a prime (78273259) 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, 931783 + ... + 931866.

It is an arithmetic number, because the mean of its divisors is an integer number (11181900).

Almost surely, 2^78273258 is an apocalyptic number.

78273258 is an abundant number, since it is smaller than the sum of its proper divisors (100637142).

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

78273258 is a wasteful number, since it uses less digits than its factorization.

78273258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863661.

The product of its digits is 188160, while the sum is 42.

The square root of 78273258 is about 8847.2175286923. The cubic root of 78273258 is about 427.7642345793.

The spelling of 78273258 in words is "seventy-eight million, two hundred seventy-three thousand, two hundred fifty-eight".