53978889 has 32 divisors (see below), whose sum is σ = 78059520. Its totient is φ = 33106752.

The previous prime is 53978887. The next prime is 53978891. The reversal of 53978889 is 98887935.

It is an interprime number because it is at equal distance from previous prime (53978887) and next prime (53978891).

It is not a de Polignac number, because 53978889 - 2¹ = 53978887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53978887) 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, 175674 + ... + 175980.

It is an arithmetic number, because the mean of its divisors is an integer number (2439360).

Almost surely, 2^53978889 is an apocalyptic number.

It is an amenable number.

53978889 is a deficient number, since it is larger than the sum of its proper divisors (24080631).

53978889 is a wasteful number, since it uses less digits than its factorization.

53978889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429.

The product of its digits is 4354560, while the sum is 57.

The square root of 53978889 is about 7347.0326663218. The cubic root of 53978889 is about 377.9270526348.

The spelling of 53978889 in words is "fifty-three million, nine hundred seventy-eight thousand, eight hundred eighty-nine".