77721049 has 8 divisors (see below), whose sum is σ = 88941888. Its totient is φ = 66529680.

The previous prime is 77721047. The next prime is 77721067. The reversal of 77721049 is 94012777.

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

It is not a de Polignac number, because 77721049 - 2¹ = 77721047 is a prime.

It is a super-2 number, since 2×77721049² = 12081122915320802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77720999 and 77721017.

It is not an unprimeable number, because it can be changed into a prime (77721047) 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, 1387 + ... + 12544.

It is an arithmetic number, because the mean of its divisors is an integer number (11117736).

Almost surely, 2^77721049 is an apocalyptic number.

It is an amenable number.

77721049 is a deficient number, since it is larger than the sum of its proper divisors (11220839).

77721049 is a wasteful number, since it uses less digits than its factorization.

77721049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14735.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 77721049 is about 8815.9542308249. The cubic root of 77721049 is about 426.7559168626.

The spelling of 77721049 in words is "seventy-seven million, seven hundred twenty-one thousand, forty-nine".