78233140 has 24 divisors (see below), whose sum is σ = 164476872. Its totient is φ = 31257600.

The previous prime is 78233107. The next prime is 78233159. The reversal of 78233140 is 4133287.

It can be written as a sum of positive squares in 4 ways, for example, as 1705636 + 76527504 = 1306^2 + 8748^2 .

It is a super-2 number, since 2×78233140² = 12240848388519200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78233099 and 78233108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22392 + ... + 25648.

It is an arithmetic number, because the mean of its divisors is an integer number (6853203).

Almost surely, 2^78233140 is an apocalyptic number.

It is an amenable number.

78233140 is an abundant number, since it is smaller than the sum of its proper divisors (86243732).

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

78233140 is a wasteful number, since it uses less digits than its factorization.

78233140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4467 (or 4465 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 78233140 is about 8844.9499715940. The cubic root of 78233140 is about 427.6911403164.

The spelling of 78233140 in words is "seventy-eight million, two hundred thirty-three thousand, one hundred forty".