53157780 has 72 divisors (see below), whose sum is σ = 173656392. Its totient is φ = 13084416.

The previous prime is 53157773. The next prime is 53157787. The reversal of 53157780 is 8775135.

53157780 is a `hidden beast` number, since 5 + 3 + 1 + 577 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (53157773) and next prime (53157787).

It can be written as a sum of positive squares in 4 ways, for example, as 101124 + 53056656 = 318^2 + 7284^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53157787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9019 + ... + 13698.

Almost surely, 2^53157780 is an apocalyptic number.

It is an amenable number.

53157780 is an abundant number, since it is smaller than the sum of its proper divisors (120498612).

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

53157780 is a wasteful number, since it uses less digits than its factorization.

53157780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22745 (or 22740 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 53157780 is about 7290.9382112318. The cubic root of 53157780 is about 376.0009525402. Note that the first 3 decimals are identical.

It can be divided in two parts, 531 and 57780, that added together give a triangular number (58311 = T₃₄₁).

The spelling of 53157780 in words is "fifty-three million, one hundred fifty-seven thousand, seven hundred eighty".