28465631 has 2 divisors, whose sum is σ = 28465632. Its totient is φ = 28465630.

The previous prime is 28465609. The next prime is 28465639. The reversal of 28465631 is 13656482.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28465631 is a prime.

It is a super-2 number, since 2×28465631² = 1620584296456322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28465591 and 28465600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28465639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14232815 + 14232816.

It is an arithmetic number, because the mean of its divisors is an integer number (14232816).

Almost surely, 2^28465631 is an apocalyptic number.

28465631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28465631 is an equidigital number, since it uses as much as digits as its factorization.

28465631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 28465631 is about 5335.3192031967. The cubic root of 28465631 is about 305.3329017631.

The spelling of 28465631 in words is "twenty-eight million, four hundred sixty-five thousand, six hundred thirty-one".