47697779 has 4 divisors (see below), whose sum is σ = 49342560. Its totient is φ = 46053000.

The previous prime is 47697739. The next prime is 47697787. The reversal of 47697779 is 97779674.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97779674 = 2 ⋅48889837.

It is a cyclic number.

It is not a de Polignac number, because 47697779 - 2⁸ = 47697523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47697739) 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, 822347 + ... + 822404.

It is an arithmetic number, because the mean of its divisors is an integer number (12335640).

Almost surely, 2^47697779 is an apocalyptic number.

47697779 is a deficient number, since it is larger than the sum of its proper divisors (1644781).

47697779 is a wasteful number, since it uses less digits than its factorization.

47697779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644780.

The product of its digits is 4667544, while the sum is 56.

The square root of 47697779 is about 6906.3578679359. The cubic root of 47697779 is about 362.6597732472.

The spelling of 47697779 in words is "forty-seven million, six hundred ninety-seven thousand, seven hundred seventy-nine".