78238965 has 16 divisors (see below), whose sum is σ = 143065728. Its totient is φ = 35766336.

The previous prime is 78238949. The next prime is 78238969. The reversal of 78238965 is 56983287.

It is not a de Polignac number, because 78238965 - 2⁴ = 78238949 is a prime.

It is a super-2 number, since 2×78238965² = 12242671288542450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78238969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372462 + ... + 372671.

It is an arithmetic number, because the mean of its divisors is an integer number (8941608).

Almost surely, 2^78238965 is an apocalyptic number.

It is an amenable number.

78238965 is a deficient number, since it is larger than the sum of its proper divisors (64826763).

78238965 is a wasteful number, since it uses less digits than its factorization.

78238965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745148.

The product of its digits is 725760, while the sum is 48.

The square root of 78238965 is about 8845.2792494076. The cubic root of 78238965 is about 427.7017549105.

The spelling of 78238965 in words is "seventy-eight million, two hundred thirty-eight thousand, nine hundred sixty-five".