51725778 has 32 divisors (see below), whose sum is σ = 114426816. Its totient is φ = 15484608.

The previous prime is 51725777. The next prime is 51725783. The reversal of 51725778 is 87752715.

It is a super-2 number, since 2×51725778² = 5351112219410568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51725777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6076 + ... + 11847.

It is an arithmetic number, because the mean of its divisors is an integer number (3575838).

Almost surely, 2^51725778 is an apocalyptic number.

51725778 is an abundant number, since it is smaller than the sum of its proper divisors (62701038).

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

51725778 is a wasteful number, since it uses less digits than its factorization.

51725778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17978.

The product of its digits is 137200, while the sum is 42.

The square root of 51725778 is about 7192.0635425447. The cubic root of 51725778 is about 372.5938457002.

The spelling of 51725778 in words is "fifty-one million, seven hundred twenty-five thousand, seven hundred seventy-eight".