77123057 has 4 divisors (see below), whose sum is σ = 84134256. Its totient is φ = 70111860.

The previous prime is 77123041. The next prime is 77123129. The reversal of 77123057 is 75032177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75032177 = 11 ⋅6821107.

It is a cyclic number.

It is not a de Polignac number, because 77123057 - 2⁴ = 77123041 is a prime.

It is a super-3 number, since 3×77123057³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77123027) 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, 3505583 + ... + 3505604.

It is an arithmetic number, because the mean of its divisors is an integer number (21033564).

Almost surely, 2^77123057 is an apocalyptic number.

It is an amenable number.

77123057 is a deficient number, since it is larger than the sum of its proper divisors (7011199).

77123057 is a wasteful number, since it uses less digits than its factorization.

77123057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011198.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 77123057 is about 8781.9734114833. The cubic root of 77123057 is about 425.6585996376.

The spelling of 77123057 in words is "seventy-seven million, one hundred twenty-three thousand, fifty-seven".