1520228772 has 18 divisors (see below), whose sum is σ = 3842800598. Its totient is φ = 506742912.

The previous prime is 1520228767. The next prime is 1520228813. The reversal of 1520228772 is 2778220251.

It can be written as a sum of positive squares in only one way, i.e., 1452067236 + 68161536 = 38106^2 + 8256^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1520228772² = 4622191038433255968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 42228577 = 1520228772 / (1 + 5 + 2 + 0 + 2 + 2 + 8 + 7 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21114253 + ... + 21114324.

Almost surely, 2^1520228772 is an apocalyptic number.

1520228772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1520228772 is an abundant number, since it is smaller than the sum of its proper divisors (2322571826).

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

1520228772 is a wasteful number, since it uses less digits than its factorization.

1520228772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42228587 (or 42228582 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 1520228772 is about 38990.1112078435. Note that the first 3 decimals coincide. The cubic root of 1520228772 is about 1149.8370965217.

The spelling of 1520228772 in words is "one billion, five hundred twenty million, two hundred twenty-eight thousand, seven hundred seventy-two".