79778983 has 4 divisors (see below), whose sum is σ = 79798888. Its totient is φ = 79759080.

The previous prime is 79778899. The next prime is 79779001. The reversal of 79778983 is 38987797.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 79778983 - 2²¹ = 77681831 is a prime.

It is a super-2 number, since 2×79778983² = 12729372257028578, 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 (79778483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1608 + ... + 12733.

It is an arithmetic number, because the mean of its divisors is an integer number (19949722).

Almost surely, 2^79778983 is an apocalyptic number.

79778983 is a deficient number, since it is larger than the sum of its proper divisors (19905).

79778983 is a wasteful number, since it uses less digits than its factorization.

79778983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19904.

The product of its digits is 5334336, while the sum is 58.

The square root of 79778983 is about 8931.9081388021. The cubic root of 79778983 is about 430.4897664480.

The spelling of 79778983 in words is "seventy-nine million, seven hundred seventy-eight thousand, nine hundred eighty-three".