77929897 has 8 divisors (see below), whose sum is σ = 78928416. Its totient is φ = 76935552.

The previous prime is 77929871. The next prime is 77929927. The reversal of 77929897 is 79892977.

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

It is a cyclic number.

It is not a de Polignac number, because 77929897 - 2¹⁹ = 77405609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77929837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53898 + ... + 55324.

It is an arithmetic number, because the mean of its divisors is an integer number (9866052).

Almost surely, 2^77929897 is an apocalyptic number.

It is an amenable number.

77929897 is a deficient number, since it is larger than the sum of its proper divisors (998519).

77929897 is a wasteful number, since it uses less digits than its factorization.

77929897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087.

The product of its digits is 4000752, while the sum is 58.

The square root of 77929897 is about 8827.7911733344. The cubic root of 77929897 is about 427.1378271569.

It can be divided in two parts, 7792 and 9897, that added together give a square (17689 = 133²).

The spelling of 77929897 in words is "seventy-seven million, nine hundred twenty-nine thousand, eight hundred ninety-seven".