77781090 has 32 divisors (see below), whose sum is σ = 186912000. Its totient is φ = 20715264.

The previous prime is 77781073. The next prime is 77781107. The reversal of 77781090 is 9018777.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77781073) and next prime (77781107).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37911 + ... + 39909.

It is an arithmetic number, because the mean of its divisors is an integer number (5841000).

Almost surely, 2^77781090 is an apocalyptic number.

77781090 is an abundant number, since it is smaller than the sum of its proper divisors (109130910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77781090 is a wasteful number, since it uses less digits than its factorization.

77781090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306.

The product of its (nonzero) digits is 24696, while the sum is 39.

The square root of 77781090 is about 8819.3588202318. The cubic root of 77781090 is about 426.8657809519.

The spelling of 77781090 in words is "seventy-seven million, seven hundred eighty-one thousand, ninety".