78601965 has 64 divisors (see below), whose sum is σ = 145297152. Its totient is φ = 35942400.

The previous prime is 78601891. The next prime is 78602047. The reversal of 78601965 is 56910687.

It is not a de Polignac number, because 78601965 - 2²⁰ = 77553389 is a prime.

It is a super-2 number, since 2×78601965² = 12356537803722450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 434175 + ... + 434355.

It is an arithmetic number, because the mean of its divisors is an integer number (2270268).

Almost surely, 2^78601965 is an apocalyptic number.

It is an amenable number.

78601965 is a deficient number, since it is larger than the sum of its proper divisors (66695187).

78601965 is a wasteful number, since it uses less digits than its factorization.

78601965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 78601965 is about 8865.7749238293. The cubic root of 78601965 is about 428.3621941354.

It can be divided in two parts, 7860 and 1965, that multiplied together give a square (15444900 = 3930²).

The spelling of 78601965 in words is "seventy-eight million, six hundred one thousand, nine hundred sixty-five".