81622474 has 8 divisors (see below), whose sum is σ = 129635748. Its totient is φ = 38410560.

The previous prime is 81622459. The next prime is 81622477. The reversal of 81622474 is 47422618.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77316849 + 4305625 = 8793^2 + 2075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 2400661 = 81622474 / (8 + 1 + 6 + 2 + 2 + 4 + 7 + 4).

It is not an unprimeable number, because it can be changed into a prime (81622477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200297 + ... + 1200364.

Almost surely, 2^81622474 is an apocalyptic number.

81622474 is a deficient number, since it is larger than the sum of its proper divisors (48013274).

81622474 is a wasteful number, since it uses less digits than its factorization.

81622474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400680.

The product of its digits is 21504, while the sum is 34.

The square root of 81622474 is about 9034.5157036778. The cubic root of 81622474 is about 433.7803931896.

The spelling of 81622474 in words is "eighty-one million, six hundred twenty-two thousand, four hundred seventy-four".