53562978 has 96 divisors (see below), whose sum is σ = 143147520. Its totient is φ = 14787360.

The previous prime is 53562953. The next prime is 53562979. The reversal of 53562978 is 87926535.

It is a happy number.

53562978 is a `hidden beast` number, since 5 + 356 + 297 + 8 = 666.

It is a super-2 number, since 2×53562978² = 5737985224456968, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53562979) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81700 + ... + 82352.

It is an arithmetic number, because the mean of its divisors is an integer number (1491120).

Almost surely, 2^53562978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53562978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71573760).

53562978 is an abundant number, since it is smaller than the sum of its proper divisors (89584542).

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

53562978 is a wasteful number, since it uses less digits than its factorization.

53562978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 696 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 53562978 is about 7318.6732404173. The cubic root of 53562978 is about 376.9538977414.

The spelling of 53562978 in words is "fifty-three million, five hundred sixty-two thousand, nine hundred seventy-eight".