84778601 has 4 divisors (see below), whose sum is σ = 84825600. Its totient is φ = 84731604.

The previous prime is 84778591. The next prime is 84778637. The reversal of 84778601 is 10687748.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84778601 - 2¹⁴ = 84762217 is a prime.

It is a super-2 number, since 2×84778601² = 14374822375034402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84778691) 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, 20681 + ... + 24438.

It is an arithmetic number, because the mean of its divisors is an integer number (21206400).

Almost surely, 2^84778601 is an apocalyptic number.

It is an amenable number.

84778601 is a deficient number, since it is larger than the sum of its proper divisors (46999).

84778601 is a wasteful number, since it uses less digits than its factorization.

84778601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46998.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 84778601 is about 9207.5295818151. The cubic root of 84778601 is about 439.3008887449.

The spelling of 84778601 in words is "eighty-four million, seven hundred seventy-eight thousand, six hundred one".