31428455 has 4 divisors (see below), whose sum is σ = 37714152. Its totient is φ = 25142760.

The previous prime is 31428443. The next prime is 31428521. The reversal of 31428455 is 55482413.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31428455 - 2¹⁴ = 31412071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3142841 + ... + 3142850.

It is an arithmetic number, because the mean of its divisors is an integer number (9428538).

Almost surely, 2^31428455 is an apocalyptic number.

31428455 is a deficient number, since it is larger than the sum of its proper divisors (6285697).

31428455 is an equidigital number, since it uses as much as digits as its factorization.

31428455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6285696.

The product of its digits is 19200, while the sum is 32.

The square root of 31428455 is about 5606.1087217427. The cubic root of 31428455 is about 315.5786960142.

The spelling of 31428455 in words is "thirty-one million, four hundred twenty-eight thousand, four hundred fifty-five".