77290289 has 6 divisors (see below), whose sum is σ = 79233126. Its totient is φ = 75350240.

The previous prime is 77290277. The next prime is 77290303. The reversal of 77290289 is 98209277.

It can be written as a sum of positive squares in 3 ways, for example, as 38850289 + 38440000 = 6233^2 + 6200^2 .

It is not a de Polignac number, because 77290289 - 2⁸ = 77290033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77290219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55607 + ... + 56979.

It is an arithmetic number, because the mean of its divisors is an integer number (13205521).

Almost surely, 2^77290289 is an apocalyptic number.

It is an amenable number.

77290289 is a deficient number, since it is larger than the sum of its proper divisors (1942837).

77290289 is an frugal number, since it uses more digits than its factorization.

77290289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787 (or 1414 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 77290289 is about 8791.4895779953. The cubic root of 77290289 is about 425.9660405530.

The spelling of 77290289 in words is "seventy-seven million, two hundred ninety thousand, two hundred eighty-nine".