172722617428 has 12 divisors (see below), whose sum is σ = 302270307220. Its totient is φ = 86359672512.

The previous prime is 172722617407. The next prime is 172722617449. The reversal of 172722617428 is 824716227271.

It is an interprime number because it is at equal distance from previous prime (172722617407) and next prime (172722617449).

It can be written as a sum of positive squares in 2 ways, for example, as 148480750224 + 24241867204 = 385332^2 + 155698^2 .

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, 153843 + ... + 607546.

Almost surely, 2^172722617428 is an apocalyptic number.

It is an amenable number.

172722617428 is a deficient number, since it is larger than the sum of its proper divisors (129547689792).

172722617428 is a wasteful number, since it uses less digits than its factorization.

172722617428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818106 (or 818104 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 49.

The spelling of 172722617428 in words is "one hundred seventy-two billion, seven hundred twenty-two million, six hundred seventeen thousand, four hundred twenty-eight".