1597778028 has 96 divisors (see below), whose sum is σ = 5164561920. Its totient is φ = 415005120.

The previous prime is 1597778027. The next prime is 1597778029. The reversal of 1597778028 is 8208777951.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1597778027) and next prime (1597778029).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1597778027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87751 + ... + 104382.

It is an arithmetic number, because the mean of its divisors is an integer number (53797520).

Almost surely, 2^1597778028 is an apocalyptic number.

1597778028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1597778028 is an abundant number, since it is smaller than the sum of its proper divisors (3566783892).

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

1597778028 is a wasteful number, since it uses less digits than its factorization.

1597778028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192164 (or 192156 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 54.

The square root of 1597778028 is about 39972.2157004087. The cubic root of 1597778028 is about 1169.0654206655.

The spelling of 1597778028 in words is "one billion, five hundred ninety-seven million, seven hundred seventy-eight thousand, twenty-eight".