77668490 has 8 divisors (see below), whose sum is σ = 139803300. Its totient is φ = 31067392.

The previous prime is 77668471. The next prime is 77668499. The reversal of 77668490 is 9486677.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76860289 + 808201 = 8767^2 + 899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77668499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3883415 + ... + 3883434.

Almost surely, 2^77668490 is an apocalyptic number.

77668490 is a deficient number, since it is larger than the sum of its proper divisors (62134810).

77668490 is a wasteful number, since it uses less digits than its factorization.

77668490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7766856.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 77668490 is about 8812.9728241950. The cubic root of 77668490 is about 426.6596970161.

The spelling of 77668490 in words is "seventy-seven million, six hundred sixty-eight thousand, four hundred ninety".