72771767 has 4 divisors (see below), whose sum is σ = 76601880. Its totient is φ = 68941656.

The previous prime is 72771739. The next prime is 72771773. The reversal of 72771767 is 76717727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76717727 = 1061 ⋅72307.

It is a cyclic number.

It is not a de Polignac number, because 72771767 - 2¹² = 72767671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72771707) 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, 1915028 + ... + 1915065.

It is an arithmetic number, because the mean of its divisors is an integer number (19150470).

Almost surely, 2^72771767 is an apocalyptic number.

72771767 is a deficient number, since it is larger than the sum of its proper divisors (3830113).

72771767 is a wasteful number, since it uses less digits than its factorization.

72771767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830112.

The product of its digits is 201684, while the sum is 44.

The square root of 72771767 is about 8530.6369633223. The cubic root of 72771767 is about 417.4979109939.

The spelling of 72771767 in words is "seventy-two million, seven hundred seventy-one thousand, seven hundred sixty-seven".