77999977 has 8 divisors (see below), whose sum is σ = 85934592. Its totient is φ = 70206000.

The previous prime is 77999951. The next prime is 78000001.

77999977 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77999977 - 2⁷ = 77999849 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77999477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33993 + ... + 36214.

It is an arithmetic number, because the mean of its divisors is an integer number (10741824).

Almost surely, 2^77999977 is an apocalyptic number.

It is an amenable number.

77999977 is a deficient number, since it is larger than the sum of its proper divisors (7934615).

77999977 is a wasteful number, since it uses less digits than its factorization.

77999977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70319.

The product of its digits is 15752961, while the sum is 64.

The square root of 77999977 is about 8831.7595642092. The cubic root of 77999977 is about 427.2658261736.

The spelling of 77999977 in words is "seventy-seven million, nine hundred ninety-nine thousand, nine hundred seventy-seven".