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76444421 = 412718523
BaseRepresentation
bin1001000111001…
…11001100000101
312022211210000212
410203213030011
5124032210141
611330245205
71615524014
oct443471405
9168753025
1076444421
113a172909
1221726805
1312ab6bb1
14a21ca7b
156aa02eb
hex48e7305

76444421 has 4 divisors (see below), whose sum is σ = 76467072. Its totient is φ = 76421772.

The previous prime is 76444409. The next prime is 76444451. The reversal of 76444421 is 12444467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12444467 = 71777781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-76444421 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76444451) 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, 5135 + ... + 13388.

It is an arithmetic number, because the mean of its divisors is an integer number (19116768).

Almost surely, 276444421 is an apocalyptic number.

It is an amenable number.

76444421 is a deficient number, since it is larger than the sum of its proper divisors (22651).

76444421 is a wasteful number, since it uses less digits than its factorization.

76444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22650.

The product of its digits is 21504, while the sum is 32.

The square root of 76444421 is about 8743.2500250193. The cubic root of 76444421 is about 424.4064073079.

Adding to 76444421 its reverse (12444467), we get a palindrome (88888888).

The spelling of 76444421 in words is "seventy-six million, four hundred forty-four thousand, four hundred twenty-one".

Divisors: 1 4127 18523 76444421