78407238 has 64 divisors (see below), whose sum is σ = 194406912. Its totient is φ = 20528640.

The previous prime is 78407237. The next prime is 78407239. The reversal of 78407238 is 83270487.

It is an interprime number because it is at equal distance from previous prime (78407237) and next prime (78407239).

It is a super-2 number, since 2×78407238² = 12295389941577288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 78407196 and 78407205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78407237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88558 + ... + 89438.

It is an arithmetic number, because the mean of its divisors is an integer number (3037608).

Almost surely, 2^78407238 is an apocalyptic number.

78407238 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78407238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97203456).

78407238 is an abundant number, since it is smaller than the sum of its proper divisors (115999674).

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

78407238 is a wasteful number, since it uses less digits than its factorization.

78407238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 78407238 is about 8854.7861634260. The cubic root of 78407238 is about 428.0081628571.

The spelling of 78407238 in words is "seventy-eight million, four hundred seven thousand, two hundred thirty-eight".