77977019 has 8 divisors (see below), whose sum is σ = 80442960. Its totient is φ = 75530016.

The previous prime is 77977013. The next prime is 77977037. The reversal of 77977019 is 91077977.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77977019 is a prime.

It is a super-2 number, since 2×77977019² = 12160830984252722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77977013) 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, 3872 + ... + 13074.

It is an arithmetic number, because the mean of its divisors is an integer number (10055370).

Almost surely, 2^77977019 is an apocalyptic number.

77977019 is a deficient number, since it is larger than the sum of its proper divisors (2465941).

77977019 is a wasteful number, since it uses less digits than its factorization.

77977019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9469.

The product of its (nonzero) digits is 194481, while the sum is 47.

The square root of 77977019 is about 8830.4597275567. The cubic root of 77977019 is about 427.2239025228.

The spelling of 77977019 in words is "seventy-seven million, nine hundred seventy-seven thousand, nineteen".