5631506778 has 8 divisors (see below), whose sum is σ = 11263013568. Its totient is φ = 1877168924.

The previous prime is 5631506761. The next prime is 5631506801. The reversal of 5631506778 is 8776051365.

It is a sphenic number, since it is the product of 3 distinct primes.

5631506778 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469292226 + ... + 469292237.

It is an arithmetic number, because the mean of its divisors is an integer number (1407876696).

Almost surely, 2^5631506778 is an apocalyptic number.

5631506778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

5631506778 is a wasteful number, since it uses less digits than its factorization.

5631506778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938584468.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The square root of 5631506778 is about 75043.3659826103. The cubic root of 5631506778 is about 1779.1321336330.

The spelling of 5631506778 in words is "five billion, six hundred thirty-one million, five hundred six thousand, seven hundred seventy-eight".