49721820 has 24 divisors (see below), whose sum is σ = 139221264. Its totient is φ = 13259136.

The previous prime is 49721813. The next prime is 49721849. The reversal of 49721820 is 2812794.

It is a happy number.

It is a super-2 number, since 2×49721820² = 4944518768224800, which contains 22 as substring.

It is a congruent number.

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, 414289 + ... + 414408.

It is an arithmetic number, because the mean of its divisors is an integer number (5800886).

Almost surely, 2^49721820 is an apocalyptic number.

It is an amenable number.

49721820 is an abundant number, since it is smaller than the sum of its proper divisors (89499444).

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

49721820 is a wasteful number, since it uses less digits than its factorization.

49721820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828709 (or 828707 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 49721820 is about 7051.3700796370. The cubic root of 49721820 is about 367.7186629649.

The spelling of 49721820 in words is "forty-nine million, seven hundred twenty-one thousand, eight hundred twenty".