77683021 has 4 divisors (see below), whose sum is σ = 83658652. Its totient is φ = 71707392.

The previous prime is 77682971. The next prime is 77683031. The reversal of 77683021 is 12038677.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48846121 + 28836900 = 6989^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 77683021 - 2¹³ = 77674829 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 (77683031) 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, 2987796 + ... + 2987821.

It is an arithmetic number, because the mean of its divisors is an integer number (20914663).

Almost surely, 2^77683021 is an apocalyptic number.

It is an amenable number.

77683021 is a deficient number, since it is larger than the sum of its proper divisors (5975631).

77683021 is a wasteful number, since it uses less digits than its factorization.

77683021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5975630.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 77683021 is about 8813.7971953069. The cubic root of 77683021 is about 426.6863032819.

The spelling of 77683021 in words is "seventy-seven million, six hundred eighty-three thousand, twenty-one".