78131922 has 32 divisors (see below), whose sum is σ = 171733824. Its totient is φ = 23500800.

The previous prime is 78131917. The next prime is 78131927. The reversal of 78131922 is 22913187.

It is an interprime number because it is at equal distance from previous prime (78131917) and next prime (78131927).

It is a super-2 number, since 2×78131922² = 12209194470828168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (78131927) 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 15 ways as a sum of consecutive naturals, for example, 4722 + ... + 13362.

It is an arithmetic number, because the mean of its divisors is an integer number (5366682).

Almost surely, 2^78131922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78131922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85866912).

78131922 is an abundant number, since it is smaller than the sum of its proper divisors (93601902).

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

78131922 is a wasteful number, since it uses less digits than its factorization.

78131922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8794.

The product of its digits is 6048, while the sum is 33.

The square root of 78131922 is about 8839.2263236100. The cubic root of 78131922 is about 427.5066118467.

It can be divided in two parts, 78 and 131922, that multiplied together give a triangular number (10289916 = T₄₅₃₆).

The spelling of 78131922 in words is "seventy-eight million, one hundred thirty-one thousand, nine hundred twenty-two".