77820130 has 8 divisors (see below), whose sum is σ = 140076252. Its totient is φ = 31128048.

The previous prime is 77820121. The next prime is 77820131. The reversal of 77820130 is 3102877.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77774761 + 45369 = 8819^2 + 213^2 .

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

It is not an unprimeable number, because it can be changed into a prime (77820131) 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, 3890997 + ... + 3891016.

Almost surely, 2^77820130 is an apocalyptic number.

77820130 is a deficient number, since it is larger than the sum of its proper divisors (62256122).

77820130 is a wasteful number, since it uses less digits than its factorization.

77820130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782020.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 77820130 is about 8821.5718554008. The cubic root of 77820130 is about 426.9371867084.

The spelling of 77820130 in words is "seventy-seven million, eight hundred twenty thousand, one hundred thirty".