77492009 has 16 divisors (see below), whose sum is σ = 91257600. Its totient is φ = 64419840.

The previous prime is 77491979. The next prime is 77492011. The reversal of 77492009 is 90029477.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 77492009 - 2⁸ = 77491753 is a prime.

It is a super-2 number, since 2×77492009² = 12010022917712162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77492029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54692 + ... + 56090.

It is an arithmetic number, because the mean of its divisors is an integer number (5703600).

Almost surely, 2^77492009 is an apocalyptic number.

It is an amenable number.

77492009 is a deficient number, since it is larger than the sum of its proper divisors (13765591).

77492009 is a wasteful number, since it uses less digits than its factorization.

77492009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 77492009 is about 8802.9545608279. The cubic root of 77492009 is about 426.3362950241.

The spelling of 77492009 in words is "seventy-seven million, four hundred ninety-two thousand, nine".