77072461 has 2 divisors, whose sum is σ = 77072462. Its totient is φ = 77072460.

The previous prime is 77072453. The next prime is 77072477. The reversal of 77072461 is 16427077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53743561 + 23328900 = 7331^2 + 4830^2 .

It is a cyclic number.

It is not a de Polignac number, because 77072461 - 2³ = 77072453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77072491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38536230 + 38536231.

It is an arithmetic number, because the mean of its divisors is an integer number (38536231).

Almost surely, 2^77072461 is an apocalyptic number.

It is an amenable number.

77072461 is a deficient number, since it is larger than the sum of its proper divisors (1).

77072461 is an equidigital number, since it uses as much as digits as its factorization.

77072461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 77072461 is about 8779.0922651491. The cubic root of 77072461 is about 425.5654959031.

The spelling of 77072461 in words is "seventy-seven million, seventy-two thousand, four hundred sixty-one".