77442890 has 32 divisors (see below), whose sum is σ = 159632640. Its totient is φ = 26498304.

The previous prime is 77442851. The next prime is 77442907. The reversal of 77442890 is 9824477.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51266 + ... + 52754.

It is an arithmetic number, because the mean of its divisors is an integer number (4988520).

Almost surely, 2^77442890 is an apocalyptic number.

77442890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77442890 is an abundant number, since it is smaller than the sum of its proper divisors (82189750).

77442890 is a wasteful number, since it uses less digits than its factorization.

77442890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 77442890 is about 8800.1642030135. The cubic root of 77442890 is about 426.2461969659.

The spelling of 77442890 in words is "seventy-seven million, four hundred forty-two thousand, eight hundred ninety".