78238236 has 24 divisors (see below), whose sum is σ = 184366224. Its totient is φ = 25820800.

The previous prime is 78238231. The next prime is 78238241. The reversal of 78238236 is 63283287.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78238231) and next prime (78238241).

It is a super-2 number, since 2×78238236² = 12242443144783392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78238194 and 78238203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78238231) 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, 31065 + ... + 33488.

It is an arithmetic number, because the mean of its divisors is an integer number (7681926).

Almost surely, 2^78238236 is an apocalyptic number.

It is an amenable number.

78238236 is an abundant number, since it is smaller than the sum of its proper divisors (106127988).

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

78238236 is a wasteful number, since it uses less digits than its factorization.

78238236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64661 (or 64659 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 78238236 is about 8845.2380408896. The cubic root of 78238236 is about 427.7004265206.

The spelling of 78238236 in words is "seventy-eight million, two hundred thirty-eight thousand, two hundred thirty-six".