77913890 has 16 divisors (see below), whose sum is σ = 148495032. Its totient is φ = 29332224.

The previous prime is 77913853. The next prime is 77913911. The reversal of 77913890 is 9831977.

It can be written as a sum of positive squares in 4 ways, for example, as 63313849 + 14600041 = 7957^2 + 3821^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228989 + ... + 229328.

Almost surely, 2^77913890 is an apocalyptic number.

77913890 is a deficient number, since it is larger than the sum of its proper divisors (70581142).

77913890 is a wasteful number, since it uses less digits than its factorization.

77913890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458341.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 77913890 is about 8826.8845013402. The cubic root of 77913890 is about 427.1085800873.

The spelling of 77913890 in words is "seventy-seven million, nine hundred thirteen thousand, eight hundred ninety".