56787457 has 2 divisors, whose sum is σ = 56787458. Its totient is φ = 56787456.

The previous prime is 56787439. The next prime is 56787461. The reversal of 56787457 is 75478765.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35034561 + 21752896 = 5919^2 + 4664^2 .

It is a cyclic number.

It is not a de Polignac number, because 56787457 - 2¹⁵ = 56754689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56787457.

It is not a weakly prime, because it can be changed into another prime (56787557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28393728 + 28393729.

It is an arithmetic number, because the mean of its divisors is an integer number (28393729).

Almost surely, 2^56787457 is an apocalyptic number.

It is an amenable number.

56787457 is a deficient number, since it is larger than the sum of its proper divisors (1).

56787457 is an equidigital number, since it uses as much as digits as its factorization.

56787457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1646400, while the sum is 49.

The square root of 56787457 is about 7535.7452849735. The cubic root of 56787457 is about 384.3711711518.

The spelling of 56787457 in words is "fifty-six million, seven hundred eighty-seven thousand, four hundred fifty-seven".