50991810 has 16 divisors (see below), whose sum is σ = 122380416. Its totient is φ = 13597808.

The previous prime is 50991799. The next prime is 50991821. The reversal of 50991810 is 1819905.

It is an interprime number because it is at equal distance from previous prime (50991799) and next prime (50991821).

It is a super-2 number, since 2×50991810² = 5200329374152200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849834 + ... + 849893.

It is an arithmetic number, because the mean of its divisors is an integer number (7648776).

Almost surely, 2^50991810 is an apocalyptic number.

50991810 is an abundant number, since it is smaller than the sum of its proper divisors (71388606).

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

50991810 is a wasteful number, since it uses less digits than its factorization.

50991810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699737.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 50991810 is about 7140.8549908257. The cubic root of 50991810 is about 370.8231248575.

The spelling of 50991810 in words is "fifty million, nine hundred ninety-one thousand, eight hundred ten".