72497977 has 4 divisors (see below), whose sum is σ = 76313680. Its totient is φ = 68682276.

The previous prime is 72497959. The next prime is 72497981. The reversal of 72497977 is 77979427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77979427 = 2687 ⋅29021.

It is a cyclic number.

It is not a de Polignac number, because 72497977 - 2⁷ = 72497849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72497917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907823 + ... + 1907860.

It is an arithmetic number, because the mean of its divisors is an integer number (19078420).

Almost surely, 2^72497977 is an apocalyptic number.

It is an amenable number.

72497977 is a deficient number, since it is larger than the sum of its proper divisors (3815703).

72497977 is a wasteful number, since it uses less digits than its factorization.

72497977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815702.

The product of its digits is 1555848, while the sum is 52.

The square root of 72497977 is about 8514.5743874841. The cubic root of 72497977 is about 416.9736673636.

The spelling of 72497977 in words is "seventy-two million, four hundred ninety-seven thousand, nine hundred seventy-seven".