76447561 has 8 divisors (see below), whose sum is σ = 79859520. Its totient is φ = 73042992.

The previous prime is 76447537. The next prime is 76447573. The reversal of 76447561 is 16574467.

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

It is a cyclic number.

It is not a de Polignac number, because 76447561 - 2¹⁷ = 76316489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76447531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36211 + ... + 38263.

It is an arithmetic number, because the mean of its divisors is an integer number (9982440).

Almost surely, 2^76447561 is an apocalyptic number.

It is an amenable number.

76447561 is a deficient number, since it is larger than the sum of its proper divisors (3411959).

76447561 is a wasteful number, since it uses less digits than its factorization.

76447561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695.

The product of its digits is 141120, while the sum is 40.

The square root of 76447561 is about 8743.4295902695. The cubic root of 76447561 is about 424.4122181435.

The spelling of 76447561 in words is "seventy-six million, four hundred forty-seven thousand, five hundred sixty-one".