77620027 has 4 divisors (see below), whose sum is σ = 77756536. Its totient is φ = 77483520.

The previous prime is 77620007. The next prime is 77620033. The reversal of 77620027 is 72002677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72002677 = 31 ⋅2322667.

It is a cyclic number.

It is not a de Polignac number, because 77620027 - 2¹¹ = 77617979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77620007) 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, 67398 + ... + 68539.

It is an arithmetic number, because the mean of its divisors is an integer number (19439134).

Almost surely, 2^77620027 is an apocalyptic number.

77620027 is a deficient number, since it is larger than the sum of its proper divisors (136509).

77620027 is a wasteful number, since it uses less digits than its factorization.

77620027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136508.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 77620027 is about 8810.2228689177. Note that the first 3 decimals coincide. The cubic root of 77620027 is about 426.5709372499.

The spelling of 77620027 in words is "seventy-seven million, six hundred twenty thousand, twenty-seven".