78362172 has 108 divisors (see below), whose sum is σ = 238021056. Its totient is φ = 21651840.

The previous prime is 78362159. The next prime is 78362191. The reversal of 78362172 is 27126387.

It is a super-2 number, since 2×78362172² = 12281260001115168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53968 + ... + 55400.

Almost surely, 2^78362172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78362172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119010528).

78362172 is an abundant number, since it is smaller than the sum of its proper divisors (159658884).

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

78362172 is a wasteful number, since it uses less digits than its factorization.

78362172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1476 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 78362172 is about 8852.2410721805. The cubic root of 78362172 is about 427.9261452907.

The spelling of 78362172 in words is "seventy-eight million, three hundred sixty-two thousand, one hundred seventy-two".