161622540 has 60 divisors (see below), whose sum is σ = 507020976. Its totient is φ = 43098912.

The previous prime is 161622529. The next prime is 161622557. The reversal of 161622540 is 45226161.

161622540 is a `hidden beast` number, since 1 + 61 + 62 + 2 + 540 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×161622540² = 52243690872103200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48264 + ... + 51503.

Almost surely, 2^161622540 is an apocalyptic number.

161622540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161622540 is an abundant number, since it is smaller than the sum of its proper divisors (345398436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161622540 is a wasteful number, since it uses less digits than its factorization.

161622540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99788 (or 99777 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 161622540 is about 12713.0853847522. The cubic root of 161622540 is about 544.7124594930.

The spelling of 161622540 in words is "one hundred sixty-one million, six hundred twenty-two thousand, five hundred forty".