77161972 has 12 divisors (see below), whose sum is σ = 136273060. Its totient is φ = 38226816.

The previous prime is 77161969. The next prime is 77161993. The reversal of 77161972 is 27916177.

It can be written as a sum of positive squares in 2 ways, for example, as 35093776 + 42068196 = 5924^2 + 6486^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88053 + ... + 88924.

Almost surely, 2^77161972 is an apocalyptic number.

It is an amenable number.

77161972 is a deficient number, since it is larger than the sum of its proper divisors (59111088).

77161972 is a wasteful number, since it uses less digits than its factorization.

77161972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177090 (or 177088 counting only the distinct ones).

The product of its digits is 37044, while the sum is 40.

The square root of 77161972 is about 8784.1887502489. The cubic root of 77161972 is about 425.7301809942.

The spelling of 77161972 in words is "seventy-seven million, one hundred sixty-one thousand, nine hundred seventy-two".