1672978736 has 160 divisors (see below), whose sum is σ = 3986411520. Its totient is φ = 669772800.

The previous prime is 1672978693. The next prime is 1672978757. The reversal of 1672978736 is 6378792761.

It is a super-2 number, since 2×1672978736² = 5597715702216315392, which contains 22 as substring.

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, 7305470 + ... + 7305698.

It is an arithmetic number, because the mean of its divisors is an integer number (24915072).

Almost surely, 2^1672978736 is an apocalyptic number.

1672978736 is a gapful number since it is divisible by the number (16) 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 1672978736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1993205760).

1672978736 is an abundant number, since it is smaller than the sum of its proper divisors (2313432784).

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

1672978736 is a wasteful number, since it uses less digits than its factorization.

1672978736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 389 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 56.

The square root of 1672978736 is about 40902.0627352705. The cubic root of 1672978736 is about 1187.1259730786.

The spelling of 1672978736 in words is "one billion, six hundred seventy-two million, nine hundred seventy-eight thousand, seven hundred thirty-six".