1691533480 has 128 divisors (see below), whose sum is σ = 4699296000. Its totient is φ = 533624832.

The previous prime is 1691533409. The next prime is 1691533511. The reversal of 1691533480 is 843351961.

It is a super-2 number, since 2×1691533480² = 5722571027921820800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1611996 + ... + 1613044.

It is an arithmetic number, because the mean of its divisors is an integer number (36713250).

Almost surely, 2^1691533480 is an apocalyptic number.

1691533480 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 1691533480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2349648000).

1691533480 is an abundant number, since it is smaller than the sum of its proper divisors (3007762520).

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

1691533480 is a wasteful number, since it uses less digits than its factorization.

1691533480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1691533480 is about 41128.2564668137. The cubic root of 1691533480 is about 1191.4985898430.

The spelling of 1691533480 in words is "one billion, six hundred ninety-one million, five hundred thirty-three thousand, four hundred eighty".