78227646 has 64 divisors (see below), whose sum is σ = 190660608. Its totient is φ = 20911968.

The previous prime is 78227641. The next prime is 78227647. The reversal of 78227646 is 64672287.

It is a super-2 number, since 2×78227646² = 12239129197402632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 78227598 and 78227607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78227641) 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, 44541 + ... + 46263.

It is an arithmetic number, because the mean of its divisors is an integer number (2979072).

Almost surely, 2^78227646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78227646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95330304).

78227646 is an abundant number, since it is smaller than the sum of its proper divisors (112432962).

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

78227646 is a wasteful number, since it uses less digits than its factorization.

78227646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805.

The product of its digits is 225792, while the sum is 42.

The square root of 78227646 is about 8844.6393934405. The cubic root of 78227646 is about 427.6811284036.

The spelling of 78227646 in words is "seventy-eight million, two hundred twenty-seven thousand, six hundred forty-six".