77620379 has 2 divisors, whose sum is σ = 77620380. Its totient is φ = 77620378.

The previous prime is 77620363. The next prime is 77620393. The reversal of 77620379 is 97302677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77620379 - 2⁴ = 77620363 is a prime.

It is a super-2 number, since 2×77620379² = 12049846472207282, which contains 22 as substring.

It is a Chen prime.

It is equal to p_4538669 and since 77620379 and 4538669 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (77620399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38810189 + 38810190.

It is an arithmetic number, because the mean of its divisors is an integer number (38810190).

Almost surely, 2^77620379 is an apocalyptic number.

77620379 is a deficient number, since it is larger than the sum of its proper divisors (1).

77620379 is an equidigital number, since it uses as much as digits as its factorization.

77620379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 41.

The square root of 77620379 is about 8810.2428456882. The cubic root of 77620379 is about 426.5715820695.

The spelling of 77620379 in words is "seventy-seven million, six hundred twenty thousand, three hundred seventy-nine".