79815646 has 16 divisors (see below), whose sum is σ = 127534176. Its totient is φ = 37332736.

The previous prime is 79815641. The next prime is 79815647. The reversal of 79815646 is 64651897.

It is a junction number, because it is equal to n+sod(n) for n = 79815596 and 79815605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79815641) 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, 1351 + ... + 12706.

It is an arithmetic number, because the mean of its divisors is an integer number (7970886).

Almost surely, 2^79815646 is an apocalyptic number.

79815646 is a deficient number, since it is larger than the sum of its proper divisors (47718530).

79815646 is a wasteful number, since it uses less digits than its factorization.

79815646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14243.

The product of its digits is 362880, while the sum is 46.

The square root of 79815646 is about 8933.9602640710. The cubic root of 79815646 is about 430.5557012285. Note that the first 3 decimals are identical.

The spelling of 79815646 in words is "seventy-nine million, eight hundred fifteen thousand, six hundred forty-six".