77950917 has 40 divisors (see below), whose sum is σ = 128589120. Its totient is φ = 46664640.

The previous prime is 77950883. The next prime is 77950921. The reversal of 77950917 is 71905977.

It is a de Polignac number, because none of the positive numbers 2^k-77950917 is a prime.

It is a super-2 number, since 2×77950917² = 12152690922281778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77950937) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 78808 + ... + 79790.

It is an arithmetic number, because the mean of its divisors is an integer number (3214728).

Almost surely, 2^77950917 is an apocalyptic number.

77950917 is the 7209-th pentagonal number.

It is an amenable number.

77950917 is a deficient number, since it is larger than the sum of its proper divisors (50638203).

77950917 is a wasteful number, since it uses less digits than its factorization.

77950917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 138915, while the sum is 45.

The square root of 77950917 is about 8828.9816513571. The cubic root of 77950917 is about 427.1762276097.

The spelling of 77950917 in words is "seventy-seven million, nine hundred fifty thousand, nine hundred seventeen".