77964019 has 4 divisors (see below), whose sum is σ = 89101744. Its totient is φ = 66826296.

The previous prime is 77963999. The next prime is 77964037. The reversal of 77964019 is 91046977.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91046977 = 7 ⋅13006711.

It is a cyclic number.

It is not a de Polignac number, because 77964019 - 2⁷ = 77963891 is a prime.

It is a super-2 number, since 2×77964019² = 12156776517264722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77964119) 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, 5568852 + ... + 5568865.

It is an arithmetic number, because the mean of its divisors is an integer number (22275436).

Almost surely, 2^77964019 is an apocalyptic number.

77964019 is a deficient number, since it is larger than the sum of its proper divisors (11137725).

77964019 is a wasteful number, since it uses less digits than its factorization.

77964019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137724.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 77964019 is about 8829.7236083583. The cubic root of 77964019 is about 427.2001595471.

The spelling of 77964019 in words is "seventy-seven million, nine hundred sixty-four thousand, nineteen".