78131952 has 150 divisors (see below), whose sum is σ = 240094008. Its totient is φ = 24525504.

The previous prime is 78131951. The next prime is 78131953. The reversal of 78131952 is 25913187.

It is an interprime number because it is at equal distance from previous prime (78131951) and next prime (78131953).

It is a super-2 number, since 2×78131952² = 12209203846660608, 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 not an unprimeable number, because it can be changed into a prime (78131951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 467773 + ... + 467939.

Almost surely, 2^78131952 is an apocalyptic number.

78131952 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78131952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120047004).

78131952 is an abundant number, since it is smaller than the sum of its proper divisors (161962056).

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

78131952 is a wasteful number, since it uses less digits than its factorization.

78131952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 191 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 78131952 is about 8839.2280205909. The cubic root of 78131952 is about 427.5066665627.

The spelling of 78131952 in words is "seventy-eight million, one hundred thirty-one thousand, nine hundred fifty-two".