77921453 has 8 divisors (see below), whose sum is σ = 78488760. Its totient is φ = 77356800.

The previous prime is 77921429. The next prime is 77921471. The reversal of 77921453 is 35412977.

It can be written as a sum of positive squares in 4 ways, for example, as 21325924 + 56595529 = 4618^2 + 7523^2 .

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 77921453 - 2²² = 73727149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77921423) 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, 129353 + ... + 129953.

It is an arithmetic number, because the mean of its divisors is an integer number (9811095).

Almost surely, 2^77921453 is an apocalyptic number.

It is an amenable number.

77921453 is a deficient number, since it is larger than the sum of its proper divisors (567307).

77921453 is a wasteful number, since it uses less digits than its factorization.

77921453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327.

The product of its digits is 52920, while the sum is 38.

The square root of 77921453 is about 8827.3128980455. The cubic root of 77921453 is about 427.1223992650.

The spelling of 77921453 in words is "seventy-seven million, nine hundred twenty-one thousand, four hundred fifty-three".