78021601 has 8 divisors (see below), whose sum is σ = 89631104. Its totient is φ = 66528000.

The previous prime is 78021569. The next prime is 78021607. The reversal of 78021601 is 10612087.

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

It is not a de Polignac number, because 78021601 - 2⁵ = 78021569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78021607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27525 + ... + 30226.

It is an arithmetic number, because the mean of its divisors is an integer number (11203888).

Almost surely, 2^78021601 is an apocalyptic number.

It is an amenable number.

78021601 is a deficient number, since it is larger than the sum of its proper divisors (11609503).

78021601 is a wasteful number, since it uses less digits than its factorization.

78021601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57951.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 78021601 is about 8832.9836974830. The cubic root of 78021601 is about 427.3053062816.

Adding to 78021601 its reverse (10612087), we get a palindrome (88633688).

The spelling of 78021601 in words is "seventy-eight million, twenty-one thousand, six hundred one".