78396551 has 8 divisors (see below), whose sum is σ = 82900608. Its totient is φ = 74016000.

The previous prime is 78396533. The next prime is 78396589. The reversal of 78396551 is 15569387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78396551 - 2¹⁴ = 78380167 is a prime.

It is a super-2 number, since 2×78396551² = 12292038417391202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78396151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29570 + ... + 32111.

It is an arithmetic number, because the mean of its divisors is an integer number (10362576).

Almost surely, 2^78396551 is an apocalyptic number.

78396551 is a deficient number, since it is larger than the sum of its proper divisors (4504057).

78396551 is a wasteful number, since it uses less digits than its factorization.

78396551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61753.

The product of its digits is 226800, while the sum is 44.

The square root of 78396551 is about 8854.1826839071. The cubic root of 78396551 is about 427.9887159659.

The spelling of 78396551 in words is "seventy-eight million, three hundred ninety-six thousand, five hundred fifty-one".