77620531 has 2 divisors, whose sum is σ = 77620532. Its totient is φ = 77620530.

The previous prime is 77620523. The next prime is 77620579. The reversal of 77620531 is 13502677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77620531 - 2³ = 77620523 is a prime.

It is a super-2 number, since 2×77620531² = 12049893665443922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77620493 and 77620502.

It is not a weakly prime, because it can be changed into another prime (77620511) 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, 38810265 + 38810266.

It is an arithmetic number, because the mean of its divisors is an integer number (38810266).

Almost surely, 2^77620531 is an apocalyptic number.

77620531 is a deficient number, since it is larger than the sum of its proper divisors (1).

77620531 is an equidigital number, since it uses as much as digits as its factorization.

77620531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 77620531 is about 8810.2514720069. The cubic root of 77620531 is about 426.5718605137.

The spelling of 77620531 in words is "seventy-seven million, six hundred twenty thousand, five hundred thirty-one".