77878045 has 16 divisors (see below), whose sum is σ = 110251008. Its totient is φ = 51678720.

The previous prime is 77878039. The next prime is 77878103. The reversal of 77878045 is 54087877.

It is not a de Polignac number, because 77878045 - 2¹⁷ = 77746973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77877986 and 77878004.

It is a congruent number.

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, 34804 + ... + 36973.

It is an arithmetic number, because the mean of its divisors is an integer number (6890688).

Almost surely, 2^77878045 is an apocalyptic number.

It is an amenable number.

77878045 is a deficient number, since it is larger than the sum of its proper divisors (32372963).

77878045 is a wasteful number, since it uses less digits than its factorization.

77878045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71820.

The product of its (nonzero) digits is 439040, while the sum is 46.

The square root of 77878045 is about 8824.8538231520. The cubic root of 77878045 is about 427.0430716332.

The spelling of 77878045 in words is "seventy-seven million, eight hundred seventy-eight thousand, forty-five".