1220371672 has 64 divisors (see below), whose sum is σ = 2607091200. Its totient is φ = 530893440.

The previous prime is 1220371657. The next prime is 1220371787. The reversal of 1220371672 is 2761730221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415473 + ... + 418399.

It is an arithmetic number, because the mean of its divisors is an integer number (40735800).

Almost surely, 2^1220371672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220371672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1303545600).

1220371672 is an abundant number, since it is smaller than the sum of its proper divisors (1386719528).

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

1220371672 is a wasteful number, since it uses less digits than its factorization.

1220371672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176 (or 3172 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 1220371672 is about 34933.8184571913. The cubic root of 1220371672 is about 1068.6382280338.

The spelling of 1220371672 in words is "one billion, two hundred twenty million, three hundred seventy-one thousand, six hundred seventy-two".