77622981 has 8 divisors (see below), whose sum is σ = 103550304. Its totient is φ = 51722160.

The previous prime is 77622971. The next prime is 77622983. The reversal of 77622981 is 18922677.

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

It is not a de Polignac number, because 77622981 - 2⁵ = 77622949 is a prime.

It is a super-2 number, since 2×77622981² = 12050654358652722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77622983) 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, 1710 + ... + 12576.

It is an arithmetic number, because the mean of its divisors is an integer number (12943788).

Almost surely, 2^77622981 is an apocalyptic number.

It is an amenable number.

77622981 is a deficient number, since it is larger than the sum of its proper divisors (25927323).

77622981 is a wasteful number, since it uses less digits than its factorization.

77622981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13251.

The product of its digits is 84672, while the sum is 42.

The square root of 77622981 is about 8810.3905134790. The cubic root of 77622981 is about 426.5763485447.

The spelling of 77622981 in words is "seventy-seven million, six hundred twenty-two thousand, nine hundred eighty-one".