155224690 has 16 divisors (see below), whose sum is σ = 280202328. Its totient is φ = 61912576.

The previous prime is 155224679. The next prime is 155224697. The reversal of 155224690 is 96422551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 116920969 + 38303721 = 10813^2 + 6189^2 .

It is a super-2 number, since 2×155224690² = 48189408771192200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155224697) 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, 18457 + ... + 25516.

Almost surely, 2^155224690 is an apocalyptic number.

155224690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155224690 is a deficient number, since it is larger than the sum of its proper divisors (124977638).

155224690 is a wasteful number, since it uses less digits than its factorization.

155224690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44333.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 155224690 is about 12458.9200976650. The cubic root of 155224690 is about 537.4279723206.

The spelling of 155224690 in words is "one hundred fifty-five million, two hundred twenty-four thousand, six hundred ninety".