73780649 has 2 divisors, whose sum is σ = 73780650. Its totient is φ = 73780648.

The previous prime is 73780633. The next prime is 73780657. The reversal of 73780649 is 94608737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71284249 + 2496400 = 8443^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 73780649 - 2⁴ = 73780633 is a prime.

It is a super-2 number, since 2×73780649² = 10887168333722402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73780349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36890324 + 36890325.

It is an arithmetic number, because the mean of its divisors is an integer number (36890325).

Almost surely, 2^73780649 is an apocalyptic number.

It is an amenable number.

73780649 is a deficient number, since it is larger than the sum of its proper divisors (1).

73780649 is an equidigital number, since it uses as much as digits as its factorization.

73780649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 73780649 is about 8589.5662870718. The cubic root of 73780649 is about 419.4184108216.

The spelling of 73780649 in words is "seventy-three million, seven hundred eighty thousand, six hundred forty-nine".