78153329 has 4 divisors (see below), whose sum is σ = 78214884. Its totient is φ = 78091776.

The previous prime is 78153319. The next prime is 78153353. The reversal of 78153329 is 92335187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73068304 + 5085025 = 8548^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 78153329 - 2⁸ = 78153073 is a prime.

It is a super-2 number, since 2×78153329² = 12215885667564482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78153292 and 78153301.

It is not an unprimeable number, because it can be changed into a prime (78153319) 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 3 ways as a sum of consecutive naturals, for example, 28832 + ... + 31425.

It is an arithmetic number, because the mean of its divisors is an integer number (19553721).

Almost surely, 2^78153329 is an apocalyptic number.

It is an amenable number.

78153329 is a deficient number, since it is larger than the sum of its proper divisors (61555).

78153329 is a wasteful number, since it uses less digits than its factorization.

78153329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61554.

The product of its digits is 45360, while the sum is 38.

The square root of 78153329 is about 8840.4371498247. The cubic root of 78153329 is about 427.5456517941.

The spelling of 78153329 in words is "seventy-eight million, one hundred fifty-three thousand, three hundred twenty-nine".