81007455 has 16 divisors (see below), whose sum is σ = 130332384. Its totient is φ = 42963840.

The previous prime is 81007439. The next prime is 81007463. The reversal of 81007455 is 55470018.

It is not a de Polignac number, because 81007455 - 2⁴ = 81007439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12204 + ... + 17633.

It is an arithmetic number, because the mean of its divisors is an integer number (8145774).

Almost surely, 2^81007455 is an apocalyptic number.

81007455 is a deficient number, since it is larger than the sum of its proper divisors (49324929).

81007455 is a wasteful number, since it uses less digits than its factorization.

81007455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30026.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 81007455 is about 9000.4141571374. The cubic root of 81007455 is about 432.6881447227.

The spelling of 81007455 in words is "eighty-one million, seven thousand, four hundred fifty-five".