77721063 has 16 divisors (see below), whose sum is σ = 118563840. Its totient is φ = 44362656.

The previous prime is 77721047. The next prime is 77721067. The reversal of 77721063 is 36012777.

It is not a de Polignac number, because 77721063 - 2⁴ = 77721047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77721067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26473 + ... + 29261.

It is an arithmetic number, because the mean of its divisors is an integer number (7410240).

Almost surely, 2^77721063 is an apocalyptic number.

77721063 is a deficient number, since it is larger than the sum of its proper divisors (40842777).

77721063 is a wasteful number, since it uses less digits than its factorization.

77721063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126.

The product of its (nonzero) digits is 12348, while the sum is 33.

The square root of 77721063 is about 8815.9550248399. The cubic root of 77721063 is about 426.7559424867.

The spelling of 77721063 in words is "seventy-seven million, seven hundred twenty-one thousand, sixty-three".