79778061 has 16 divisors (see below), whose sum is σ = 128934720. Its totient is φ = 48350160.

The previous prime is 79778047. The next prime is 79778063. The reversal of 79778061 is 16087797.

It is a happy number.

It is not a de Polignac number, because 79778061 - 2¹³ = 79769869 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 79777998 and 79778016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79778063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134010 + ... + 134603.

It is an arithmetic number, because the mean of its divisors is an integer number (8058420).

Almost surely, 2^79778061 is an apocalyptic number.

It is an amenable number.

79778061 is a deficient number, since it is larger than the sum of its proper divisors (49156659).

79778061 is a wasteful number, since it uses less digits than its factorization.

79778061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268633 (or 268627 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 79778061 is about 8931.8565259413. The cubic root of 79778061 is about 430.4881080618.

The spelling of 79778061 in words is "seventy-nine million, seven hundred seventy-eight thousand, sixty-one".