77988553 has 2 divisors, whose sum is σ = 77988554. Its totient is φ = 77988552.

The previous prime is 77988527. The next prime is 77988583. The reversal of 77988553 is 35588977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48958009 + 29030544 = 6997^2 + 5388^2 .

It is a cyclic number.

It is not a de Polignac number, because 77988553 - 2¹³ = 77980361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77988553.

It is not a weakly prime, because it can be changed into another prime (77988523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38994276 + 38994277.

It is an arithmetic number, because the mean of its divisors is an integer number (38994277).

Almost surely, 2^77988553 is an apocalyptic number.

It is an amenable number.

77988553 is a deficient number, since it is larger than the sum of its proper divisors (1).

77988553 is an equidigital number, since it uses as much as digits as its factorization.

77988553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 52.

The square root of 77988553 is about 8831.1127837889. The cubic root of 77988553 is about 427.2449658122.

The spelling of 77988553 in words is "seventy-seven million, nine hundred eighty-eight thousand, five hundred fifty-three".