30780649 has 2 divisors, whose sum is σ = 30780650. Its totient is φ = 30780648.

The previous prime is 30780643. The next prime is 30780653. The reversal of 30780649 is 94608703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30470400 + 310249 = 5520^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 30780649 - 2³ = 30780641 is a prime.

It is a super-2 number, since 2×30780649² = 1894896705722402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30780641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15390324 + 15390325.

It is an arithmetic number, because the mean of its divisors is an integer number (15390325).

Almost surely, 2^30780649 is an apocalyptic number.

It is an amenable number.

30780649 is a deficient number, since it is larger than the sum of its proper divisors (1).

30780649 is an equidigital number, since it uses as much as digits as its factorization.

30780649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 30780649 is about 5548.0310921984. The cubic root of 30780649 is about 313.3953806755.

The spelling of 30780649 in words is "thirty million, seven hundred eighty thousand, six hundred forty-nine".