76461781 has 4 divisors (see below), whose sum is σ = 83412864. Its totient is φ = 69510700.

The previous prime is 76461773. The next prime is 76461787. The reversal of 76461781 is 18716467.

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.

It is a cyclic number.

It is not a de Polignac number, because 76461781 - 2³ = 76461773 is a prime.

It is a super-2 number, since 2×76461781² = 11692807907383922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76461787) 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, 3475525 + ... + 3475546.

It is an arithmetic number, because the mean of its divisors is an integer number (20853216).

Almost surely, 2^76461781 is an apocalyptic number.

It is an amenable number.

76461781 is a deficient number, since it is larger than the sum of its proper divisors (6951083).

76461781 is a wasteful number, since it uses less digits than its factorization.

76461781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6951082.

The product of its digits is 56448, while the sum is 40.

The square root of 76461781 is about 8744.2427345082. The cubic root of 76461781 is about 424.4385314642.

The spelling of 76461781 in words is "seventy-six million, four hundred sixty-one thousand, seven hundred eighty-one".