65077821 has 12 divisors (see below), whose sum is σ = 95289948. Its totient is φ = 42790464.

The previous prime is 65077813. The next prime is 65077841. The reversal of 65077821 is 12877056.

It can be written as a sum of positive squares in 2 ways, for example, as 12152196 + 52925625 = 3486^2 + 7275^2 .

It is not a de Polignac number, because 65077821 - 2³ = 65077813 is a prime.

It is a super-2 number, since 2×65077821² = 8470245572216082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65077801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48870 + ... + 50183.

It is an arithmetic number, because the mean of its divisors is an integer number (7940829).

Almost surely, 2^65077821 is an apocalyptic number.

It is an amenable number.

65077821 is a deficient number, since it is larger than the sum of its proper divisors (30212127).

65077821 is a wasteful number, since it uses less digits than its factorization.

65077821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99132 (or 99129 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 65077821 is about 8067.0825581495. The cubic root of 65077821 is about 402.2329718131.

The spelling of 65077821 in words is "sixty-five million, seventy-seven thousand, eight hundred twenty-one".