78231552 has 192 divisors, whose sum is σ = 254741760. Its totient is φ = 20840448.

The previous prime is 78231541. The next prime is 78231557. The reversal of 78231552 is 25513287.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×78231552² = 12240351456657408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78231557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 731083 + ... + 731189.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^78231552 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 78231552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127370880).

78231552 is an abundant number, since it is smaller than the sum of its proper divisors (176510208).

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

78231552 is a wasteful number, since it uses less digits than its factorization.

78231552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 136 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 78231552 is about 8844.8602024000. The cubic root of 78231552 is about 427.6882464954.

The spelling of 78231552 in words is "seventy-eight million, two hundred thirty-one thousand, five hundred fifty-two".