78383257 has 4 divisors (see below), whose sum is σ = 79000576. Its totient is φ = 77765940.

The previous prime is 78383251. The next prime is 78383273. The reversal of 78383257 is 75238387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78383257 - 2¹¹ = 78381209 is a prime.

It is a super-2 number, since 2×78383257² = 12287869955856098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78383251) 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, 308469 + ... + 308722.

It is an arithmetic number, because the mean of its divisors is an integer number (19750144).

Almost surely, 2^78383257 is an apocalyptic number.

It is an amenable number.

78383257 is a deficient number, since it is larger than the sum of its proper divisors (617319).

78383257 is a wasteful number, since it uses less digits than its factorization.

78383257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617318.

The product of its digits is 282240, while the sum is 43.

The square root of 78383257 is about 8853.4319334369. The cubic root of 78383257 is about 427.9645227093.

The spelling of 78383257 in words is "seventy-eight million, three hundred eighty-three thousand, two hundred fifty-seven".