81478701 has 12 divisors (see below), whose sum is σ = 117780000. Its totient is φ = 54278280.

The previous prime is 81478697. The next prime is 81478717. The reversal of 81478701 is 10787418.

It is not a de Polignac number, because 81478701 - 2² = 81478697 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81478751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13800 + ... + 18798.

It is an arithmetic number, because the mean of its divisors is an integer number (9815000).

Almost surely, 2^81478701 is an apocalyptic number.

It is an amenable number.

81478701 is a deficient number, since it is larger than the sum of its proper divisors (36301299).

81478701 is a wasteful number, since it uses less digits than its factorization.

81478701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6816 (or 6813 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 81478701 is about 9026.5553230454. Note that the first 3 decimals coincide. The cubic root of 81478701 is about 433.5255509498.

The spelling of 81478701 in words is "eighty-one million, four hundred seventy-eight thousand, seven hundred one".