53491380 has 24 divisors (see below), whose sum is σ = 149776032. Its totient is φ = 14264352.

The previous prime is 53491357. The next prime is 53491391. The reversal of 53491380 is 8319435.

It is a super-2 number, since 2×53491380² = 5722655468608800, 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 7 ways as a sum of consecutive naturals, for example, 445702 + ... + 445821.

It is an arithmetic number, because the mean of its divisors is an integer number (6240668).

Almost surely, 2^53491380 is an apocalyptic number.

It is an amenable number.

53491380 is an abundant number, since it is smaller than the sum of its proper divisors (96284652).

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

53491380 is a wasteful number, since it uses less digits than its factorization.

53491380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891535 (or 891533 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 53491380 is about 7313.7801443576. The cubic root of 53491380 is about 376.7858638951.

Adding to 53491380 its product of nonzero digits (12960), we get a triangular number (53504340 = T₁₀₃₄₄).

The spelling of 53491380 in words is "fifty-three million, four hundred ninety-one thousand, three hundred eighty".