51622578 has 72 divisors (see below), whose sum is σ = 131566032. Its totient is φ = 14584752.

The previous prime is 51622577. The next prime is 51622621. The reversal of 51622578 is 87522615.

It is a happy number.

51622578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51622573) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 94101 + ... + 94647.

It is an arithmetic number, because the mean of its divisors is an integer number (1827306).

Almost surely, 2^51622578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51622578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65783016).

51622578 is an abundant number, since it is smaller than the sum of its proper divisors (79943454).

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

51622578 is a wasteful number, since it uses less digits than its factorization.

51622578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 666 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 51622578 is about 7184.8853853071. The cubic root of 51622578 is about 372.3458888344.

The spelling of 51622578 in words is "fifty-one million, six hundred twenty-two thousand, five hundred seventy-eight".