1220762520 has 192 divisors, whose sum is σ = 4231880640. Its totient is φ = 304128000.

The previous prime is 1220762519. The next prime is 1220762531. The reversal of 1220762520 is 252670221.

1220762520 is a `hidden beast` number, since 12 + 2 + 0 + 7 + 625 + 20 = 666.

It is a super-2 number, since 2×1220762520² = 2980522260473500800, 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 47 ways as a sum of consecutive naturals, for example, 923460 + ... + 924780.

It is an arithmetic number, because the mean of its divisors is an integer number (22041045).

Almost surely, 2^1220762520 is an apocalyptic number.

1220762520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220762520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2115940320).

1220762520 is an abundant number, since it is smaller than the sum of its proper divisors (3011118120).

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

1220762520 is a wasteful number, since it uses less digits than its factorization.

1220762520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1220762520 is about 34939.4121301432. The cubic root of 1220762520 is about 1068.7522999848.

The spelling of 1220762520 in words is "one billion, two hundred twenty million, seven hundred sixty-two thousand, five hundred twenty".